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R.S. Aggarwal solutions for Mathematics [English] Class 10 ICSE chapter 5 - Quadratic Equation [Latest edition]

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Chapters

UNIT 1: COMMERCIAL MATHEMATICS

    1: Goods and Services Tax (G.S.T.)

    2: Banking

    3: Shares and Dividends

UNIT 2: ALGEBRA

    4: Linear Inequations

▶ 5: Quadratic Equation

    6: Problems on Quadratic Equations

    7: Ratio and Proportion

   Chapter 8: Remainder Theorem and Factor Theorem

    9: Matrices

   Chapter 10: Arithmetic Progression

   Chapter 11: Geometric Progression

    12: Reflection

   Chapter 13: Section and Mid-point Formulae

   Chapter 14: Equation of a Straight Line

UNIT 3: GEOMETRY

   Chapter 15: Similarity (As a Size Transformation)

   Chapter 16: Similarity of Triangles

    17: Loci

   Chapter 18: Angle and Cyclic Properties of a Circle

   Chapter 19: Tangent Properties of Circles

    20: Constructions

UNIT 4: MENSURATION

   Chapter 21: Volume and Surface Area of Solids (Cylinder, Cone and Sphere)

UNIT 5: TRIGONOMETRY

   Chapter 22: Trigonometrical Identities

   Chapter 23: Heights and Distances

UNIT 6: STATISTICS

   Chapter 24: Graphical Representation of Statistical Data

   Chapter 25: Measures of Central Tendency (Mean)

   Chapter 26: Median, Quartiles and Mode

UNIT 7: PROBABILITY

   Chapter 27: Probability

R.S. Aggarwal solutions for Mathematics [English] Class 10 ICSE chapter 5 - Quadratic Equation - Shaalaa.com
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Solutions for Chapter 5: Quadratic Equation

Below listed, you can find solutions for Chapter 5 of CISCE R.S. Aggarwal for Mathematics [English] Class 10 ICSE.


EXERCISE 5AEXERCISE 5BEXERCISE 5CCOMPETENCY-FOCUSED QUESTIONS
EXERCISE 5A [Pages 56 - 57]

R.S. Aggarwal solutions for Mathematics [English] Class 10 ICSE 5 Quadratic Equation EXERCISE 5A [Pages 56 - 57]

1.Page 56

Find which of the following are the solutions of the equation 6x2 – x – 2 = 0?

(i) `1/2`

(ii) `(-1)/2`

(iii) `2/3`

2.Page 56

Determine whether `x = (-1)/3` and `x = 2/3` are the solutions of the equation 9x2 – 3x – 2 = 0.

3.Page 57

Solve the following equation by factorization:

16x2 = 25

4.Page 57

Solve the following equation by factorization:

x2 + 2x = 24

5.Page 57

Solve the following equation by factorization:

x2 – x = 156

6.Page 57

Solve the following equation by factorization:

x2 – 11x = 42

7.Page 57

Solve the following equation by factorization:

x2 – 7x + 10 = 0

8.Page 57

Solve the following equation by factorization:

x2 + 18x = 40

9.Page 57

Solve the following equation by factorization:

x2 + 17 = 18x

10.Page 57

Solve the following equation by factorization:

3x2 = 5x

11.Page 57

Solve the following equation by factorization:

(x + 3)(x – 3) = 27

12.Page 57

Solve the following equation by factorization:

x2 – 30x + 216 = 0

13.Page 57

Solve the following equation by factorization:

12x2 + 29x + 14 = 0

14.Page 57

Solve the following equation by factorization:

2x2 – 7x = 39

15.Page 57

Solve the following equation by factorization:

10x2 = 9x + 7

16.Page 57

Solve the following equation by factorization:

15x2 – 28 = x

17.Page 57

Solve the following equation by factorization:

8x2 + 15 = 26x

18.Page 57

Solve the following equation by factorization:

3x2 + 8 = 10x

19.Page 57

Solve the following equation by factorization:

x(6x – 11) = 35

20.Page 57

Solve the following equation by factorization:

6x(3x – 7) = 7(7 – 3x)

21.Page 57

Solve the following equation by factorization:

2x2 – 9x + 10 = 0, when (i) x ∈ N (ii) x ∈ Q

22.Page 57

Solve the following equation by factorization:

4x2 – 9x – 100 = 0, when x ∈ Q

23.Page 57

Solve the following equation by factorization:

3x2 + 11x + 10 = 0, when x ∈ I

24.Page 57

Solve the following equation by factorization:

`x + 1/x = 3 1/3, x ≠ 0`

25.Page 57

Solve the following equation by factorization:

`5x - 35/x = 18`

26.Page 57

Solve the following equation by factorization:

`10x - 1/x = 3`

27.Page 57

Solve the following equation by factorization:

Зa2x2 + 8abx + 4b2 = 0, a ≠ 0

28.Page 57

Solve the following equation by factorization:

4x2 – 4ax + (a2 – b2) = 0, where a, b ∈ R

[Hint: Given equation may be written as: 4x2 – 2(a + b)x – 2(a – b)x + (a2 – b2) = 0]

29.Page 57

Solve the following equation by factorization:

5x2 – 12x – 9 = 0, when (i) x ∈ I (ii) x ∈ Q

30.Page 57

Solve the following equation by factorization:

2x2 – 11x + 15 = 0, when (i) x ∈ N (ii) x ∈ I

31.Page 57

Solve the following equation by factorization:

`sqrt(3)x^2 + 11x + 6sqrt(3) = 0`

32.Page 57

Solve the following equation by factorization:

`2sqrt(5)x^2 - 3x - sqrt(5) = 0`

33.Page 57

Solve the following equation by factorization:

`x^2 - (1 + sqrt(2))x + sqrt(2) = 0`

34.Page 57

Solve the following equation by factorization:

`(x + 1)/(x - 1) = (3x - 7)/(2x - 5)`

35.Page 57

Solve the following equation by factorization:

`(3x + 1)/(7x + 1) = (5x + 1)/(7x + 5)`

36.Page 57

Solve the following equation by factorization:

`5/((2x + 1)) + 6/((x + 1)) = 3`

37.Page 57

Solve the following equation by factorization:

`(2x)/(x - 4) + (2x - 5)/(x - 3) = 25/3`

38.Page 57

Solve the following equation by factorization:

`(x + 3)/(x - 2) - (1 - x)/x = 4 1/4`

39.Page 57

Solve the following equation by factorization:

`1/((x - 2)) + 2/((x - 1)) = 6/x`

40.Page 57

Solve the following equation by factorization:

`2(x/(x + 1))^2 - 5(x/(x + 1)) + 2 = 0, x ≠ -1`

41.Page 57

Solve the following equation by factorization:

5(3x + 1)2 + 6(3x + 1) – 8 = 0

42.Page 57

Solve the following equation by factorization:

`sqrt(x + 15) + (x + 3)`

43.Page 57

Solve the following equation by factorization:

`sqrt(2x + 9) = (13 - x)`

44.Page 57

Solve the following equation by factorization:

`sqrt(3x^2 - 2) = (2x - 1)`

45.Page 57

Solve the following equation by factorization:

`sqrt(3x^2 + x + 5) = (x - 3)`

46. (i)Page 57

Find the quadratic equation whose solution set is {2, –3}.

46. (ii)Page 57

Find the quadratic equation whose solution set is `{-3, 2/5}`.

46. (iii)Page 57

Find the quadratic equation whose solution set is `{2/5, -1/2}`.

47.Page 57

Find the value of k for which x = 3 is a solution of the quadratic equation (k + 2)x2 – kx + 6 = 0. Thus, find the other root of the equation.

EXERCISE 5B [Pages 61 - 62]

R.S. Aggarwal solutions for Mathematics [English] Class 10 ICSE 5 Quadratic Equation EXERCISE 5B [Pages 61 - 62]

1.Page 61

Solve the following equation using quadratic formula:

x2 – 4x + 1 = 0

2.Page 61

Solve the following equation using quadratic formula: 

9x2 + 7x – 2 = 0

3.Page 61

Solve the following equation using quadratic formula:

`3/4 x^2 - x - 1 = 0`

4.Page 61

Solve the following equation using quadratic formula:

4 – 11x = 3x2

5.Page 61

Solve the following equation using quadratic formula:

25x2 + 30x + 7 = 0

6.Page 61

Solve the following equation using quadratic formula:

5x2 – 19x + 17 = 0

7.Page 61

Solve the following equation using quadratic formula:

3x2 – 8x + 2 = 0

8.Page 61

Solve the following equation using quadratic formula:

`sqrt(3)x^2 + 10x - 8sqrt(3) = 0`

9.Page 61

Solve the following equation using quadratic formula:

`2x^2 + sqrt(7)x - 7 = 0`

10.Page 61

Solve the following equation using quadratic formula:

6x2 – 31x = 105

11.Page 61

Solve the following equation using quadratic formula:

`(x + 3)/(2x + 3) = (x + 1)/(3x + 2)`

12.Page 61

Solve the following equation using quadratic formula:

`(x - 1)/(x - 2) + (x - 3)/(x - 4) = 3 1/3`

13.Page 62

Solve for x and give your answer correct to 2 decimal places:

x2 – 10x + 6 = 0

14.Page 62

Solve for x and give your answer correct to 2 decimal places:

2x2 – 6x + 3 = 0

15.Page 62

Solve for x and give your answer correct to 2 decimal places: 

3x2 – 32x + 12 = 0

16.Page 62

Solve for x and give your answer correct to 2 decimal places: 

x2 + 7x = 7

17.Page 62

Solve for x and give your answer correct to 2 decimal places: 

3x2 – x – 7 = 0

18.Page 62

Solve for x and give your answer correct to 2 decimal places:

4x2 – 7x + 2 = 0

19.Page 62

Solve for x and give your answer correct to 2 decimal places:

x2 – 7x + 3 = 0

20.Page 62

Solve the following equation for x and give, in the following case, your answer correct to 2 decimal places:

x2 – 5x – 10 = 0

21.Page 62

Solve for x the quadratic equation x2 – 4x – 8 = 0. Give your answer correct to three significant figures. 

22.Page 62

Solve the following quadratic equation: x2 + 4x – 8 = 0. Give your answer correct to one decimal place.

EXERCISE 5C [Page 65]

R.S. Aggarwal solutions for Mathematics [English] Class 10 ICSE 5 Quadratic Equation EXERCISE 5C [Page 65]

1.Page 65

Discuss the nature of the roots of the following equation without actually solving it:

x2 – 8x + 7 = 0

2.Page 65

Discuss the nature of the roots of the following equation without actually solving it: 

6x2 + 7x – 10 = 0

3.Page 65

Discuss the nature of the roots of the following equation without actually solving it: 

25x2 + 30x + 7 = 0

4.Page 65

Discuss the nature of the roots of the following equation without actually solving it:

15x2 – 28 = x

5.Page 65

Discuss the nature of the roots of the following equation without actually solving it:

16x2 = 24x + 1

6.Page 65

Discuss the nature of the roots of the following equation without actually solving it:

`2x^2 - 2sqrt(6)x + 3 = 0`

7.Page 65

Discuss the nature of the roots of the following equations without actually solving it:

2x2 + 2x + 3 = 0

8.Page 65

Discuss the nature of the roots of the following equation without actually solving it:

2x2 – 5x – 4 = 0

9.Page 65

Discuss the nature of the roots of the following equation without actually solving it:

5x2 – 13x – 6 = 0

10.Page 65

Discuss the nature of the roots of the following equation without actually solving it:

9x2 – 6x + 1 = 0

11.Page 65

Discuss the nature of the roots of the following equation without actually solving it:

3x2 – 2x + 5 = 0

12.Page 65

Discuss the nature of the roots of the following equation without actually solving it:

`x^2 + 2sqrt(3)x - 1 = 0`

13.Page 65

Find the values of k for which the following equation has equal roots:

9x2 + kx + 1 = 0

14.Page 65

Find the values of k for which the following equation has equal roots:

x2 – 2kx + 7k – 12 = 0

15.Page 65

Find the values of k for which the following equation has equal roots:

(3k + 1)x2 + 2(k + 1)x + k = 0

16.Page 65

Find the values of k for which the following equation has equal roots:

x2 – 2(5 + 2k)x + 3(7 + 10k) = 0

17.Page 65

Find the values of k for which the following equation has equal roots:

(k + 1)x2 + 2(k + 3)x + (k + 8) = 0

18.Page 65

Find the values of k for which the following equation has equal roots:

kx2 + kx + 1 = –4x2 – x

19.Page 65

Find the values of k for which the following equation has equal roots:

3kx2 = 4(kx – 1)

20.Page 65

Find the values of k for which the following equation has equal roots:

x2 + 4kx + (k2 – k + 2) = 0

21.Page 66

Show that the equation x2 + ax – 1 = 0 has real and distinct roots for all real values of x.

[Hint: D = (a2 + 4) > 0.]

22.Page 66

Show that the equation 3x2 + 7x + 8 = 0 is not true for any real value of x.

[Hint: D = (49 – 4 × 3 × 8) = (49 – 96) = – 47 < 0.]

23.Page 66

If the roots of the equation (c2 – ab)x2 – 2(a2 – bc)x + (b2 – ac) = 0 are real and equal, show that either a = 0 or a3 + b3 + c3 = 3abc.

[Hint: D = 4a(a3 + b3 + c3 – 3abc). So, D = 0 ⇒ a = 0 or a3 + b3 + c3 = 3abc.]

24.Page 66

If a, b, c ∈ R, show that the roots of the equation (a – b)x2 + (b + c – a)x – с = 0 are rational.

[Hint: D = (a + c – b)2 ≥ 0]

25.Page 66

If a, b, c are rational, prove that the roots of the equation (b – c)x2 + (c – a)x + (a – b) = 0 are also rational.

[Hint: D = [(c – a)2 – 4(b – c)(a – b)] = (a + c – 2b)2 ≥ 0.]

CASE STUDY BASED QUESTIONS

I.Page 64
Shridharacharya was an Indian mathematician, Sanskrit Pandit and philosopher from Bengal. He is known for his treatises – Trisatika and Patiganita. He was the first to give an algorithm for solving quadratic equations. His other major works were on algebra, particularly fractions and he gave an exposition on zero. He separated Algebra from Arithmetic. The quadratic formula which is used to find the roots of a quadratic equation is known as Shridharacharya’s rule.

1. A quadratic equation of the form ax2 + bx + c = 0, a ≠ 0, has two roots given by:

(a) `x = (b ± sqrt(b^2 - 4abc))/(2a)`

(b) `x = (-b ± sqrt(b^2 - 2ac))/(4a)`

(c) `x = (-b ± sqrt(b^2 - 4ac))/(2ac)`

(d) `x = (-b ± sqrt(b^2 - 4ac))/(2a)`

2. A quadratic equation of the form ax² + bx + c = 0, a ≠ 0, has rational roots, if the value of (b2 – 4ac) is:

(a) less than 0 

(b) greater than 0

(c) equal to 0

(d) equal to 0 or a perfect square

3. The maximum number of roots that a quadratic equation can have is:

(a) 1

(b) 2

(c) 3 

(d) 4

4. A quadratic equation ax2 + bx + c = 0, a ≠ 0, having real coefficients, cannot have real roots if:

(a) b2 – 4ac < 0 

(b) b2 – 4ac = 0 

(c) b2 – 4ac > 0 

(d) b2 – 4ac ≥ 0

5. The quadratic equation, x2 + 26x + 169 = 0, has:

(a) non real roots 

(b) rational and unequal roots

(c) equal roots

(d) irrational roots

II.Page 65

Raman Lal runs a stationery shop in Pune. The analysis of his sales, expenditures and profits showed that for x number of notebooks sold, the weekly profit (in ₹) was P(x) = –2x2 + 88x – 680. Raman Lal found that: 

  • He has a loss if he does not sell any notebook in a week.
  • There is no profit no loss for a certain value x0 of x.
  • The profit goes on increasing with an increase in x i.e. the number of notebooks sold. But he gets a maximum profit at a sale of 22 notebooks in a week.

Now answer the following questions:

1. What will be Raman Lal’s profit if he sold 20 notebooks in a week?

  1. ₹ 144
  2. ₹ 280
  3. ₹ 340
  4. ₹ 560

2. What is the maximum profit that Raman Lal can earn in a week?

  1. ₹ 144
  2. ₹ 288
  3. ₹ 340
  4. ₹ 680

3. What is Raman Lal’s loss if he does not sell any notebooks in a particular week?

  1. ₹ 0
  2. ₹ 340
  3. ₹ 680
  4. ₹ 960

4. Write a quadratic equation for the condition when Raman Lal does not have any profit or loss during a week.

  1. 2x2 – 44x + 340 = 0
  2. x2 + 44x – 340 = 0
  3. x2 – 88x + 340 = 0
  4. x2 – 44x + 340 = 0

5. What is the minimum number of notebooks x that Raman Lal should sell in a week so that he does not incur any loss?

  1. 0
  2. 10
  3. 11
  4. 12

ASSERTION-REASON QUESTIONS Directions: In each of the following, a statement of Assertion (A) is followed by a statement of Reason (R). Choose the correct option:

1.Page 65

Assertion (A): The discriminant of the quadratic equation `x^2 + 2sqrt(2)x + 1 = 0` is less than zero.

Reason (R): The discriminant of the quadratic equation ax2 + bx + c = 0 is `sqrt(b^2 - 4ac)`.

  • A is true, R is false

  • A is false, R is true

  • Both A and R are true

  • Both A and R are false

2.Page 65

Assertion (A): The quadratic equation 3kx2 – 4kx + 4 = 0 has equal roots, if k = 3.

Reason (R): For equal roots of a quadratic equation, we must have D = 0.

  • A is true, R is the false

  • A is false, R is true

  • Both A and R are true

  • Both A and R are false

3.Page 65

Assertion (A): The roots of the quadratic equation 3x2 + 7x + 8 = 0 are imaginary.

Reason (R): The discriminant of a quadratic equation is always positive.

  • A is true, R is false

  • A is false, R is true

  • Both A and R are true

  • Both A and R are false

4.Page 65

Assertion (A): The roots of the quadratic equation 8x2 + 2x – 3 = 0 are `-1/2` and `3/4`.

Reason (R): The roots of the quadratic equation ax2 + bx + c = 0 are given by `x = (-b ± sqrt(b^2 - 4ac))/(2a)`

  • A is true, R is false

  • A is false, R is true

  • Both A and R are true

  • Both A and R are false

COMPETENCY-FOCUSED QUESTIONS [Pages 66 - 69]

R.S. Aggarwal solutions for Mathematics [English] Class 10 ICSE 5 Quadratic Equation COMPETENCY-FOCUSED QUESTIONS [Pages 66 - 69]

I. Multiple Choice Questions Choose the correct alternative :

1.Page 66

The roots of the equation px2 + qx + r = 0, where p ≠ 0, are given by:

  • `x = (-p ± sqrt(q^2 - 4pr))/(2p)`

  • `x = (-q ± sqrt(q^2 - 2pr))/(4p)`

  • `x = (-q ± sqrt(q^2 - 4pr))/(2p)`

  • `x = (-q ± sqrt(q^2 - 4pr))/(2q)`

2.Page 66

The discriminant of the quadratic equation ax2 + bx + c = 0, a ≠ 0 is given by:

  • b2 – 2ac

  • b2 – ac

  • b2 – 4ac

  • none of these

3.Page 66

For real roots of a quadratic equation, the discriminant must be:

  • greater than or equal to zero

  • greater than zero

  • less than or equal to zero

  • less than zero

4.Page 66

The roots of the quadratic equation px2 – qx + r = 0 are real and equal if ______.

  • p2 = 4qr

  • q2 = 4pr

  • –q2 = 4pr

  • p2 > 4pr

5.Page 66

If the roots of the quadratic equation, ax2 + bx + c = 0, a ≠ 0 are real and equal, then each root is equal to:

  • `(-a)/(2b)`

  • `(-b)/(2a)`

  • `(-2a)/(b)`

  • `(-c)/(2a)`

6.Page 66

If the discriminant of the quadratic equation, ax2 + bx + c = 0, a ≠ 0 is greater than zero and a perfect square and a, b, c are rational, then the roots are:

  • rational and equal

  • irrational and unequal

  • irrational and equal

  • rational and unequal

7.Page 66

If the discriminant of a quadratic equation, ax2 + bx + c = 0, is greater than zero and a perfect square and b is irrational, then the roots are:

  • irrational and unequal

  • irrational and equal

  • rational and unequal

  • rational and equal

8.Page 66

Which of the following is a quadratic equation?

  • `x^2 - 2sqrt(x) + 7 = 0`

  • 2x2 – 5x = (x – 1)2

  • `x - 1/x = 2x^2`

  • `x^2 + 1/x^2 = 2`

9.Page 67

Which of the following is a quadratic equation?

  • x2 + 1 = (2 – x)2 + 3

  • 2x2 + 3 = (5 + x) (2x – 3)

  • x3 – x2 = (x – 1)3

  • none of these

10.Page 67

Which of the following is not a quadratic equation?

  • 3x – x2 = x2 + 5

  • (x + 2)2 = 2(x2 – 5)

  • `(sqrt(2)x + 3)^2 = 2x^2 + 6`

  • (x – 1)2 = 3x2 + x – 2

11.Page 67

The roots of the quadratic equation 2x2 – x – 6 = 0 are:

  • `-2, 3/2`

  • `2, (-3)/2`

  • `-2, (-3)/2`

  • `2, (3)/2`

12.Page 67

Which of the following quadratic equations has 2 and 3 as its roots?

  • x2 – 5x + 6 = 0

  • x2 + 5x + 6 = 0

  • x2 – 5x – 6 = 0

  • x2 + 5x – 6 = 0

13.Page 67

Which of the following is a root of the quadratic equation, 3x2 + 13x + 14 = 0?

  • `-1/3`

  • `-3/2`

  • `-5/3`

  • `-7/3`

14.Page 67

If `x = -1/2` is a solution of the quadratic equation 3x2 + 2kx – 3 = 0, then the value of k is ______.

  • `-3/4`

  • `-5/4`

  • `-9/4`

  • `-4/5`

15.Page 67

If the equation, x2 – ax + 1 = 0 has two distinct and real roots, then:

  • |a| ≥ 2

  • |a| ≤ 2

  • |a| > 2

  • |a| < 2

16.Page 67

The positive value of k for which the equation x2 + kx + 64 = 0 and x2 – 8x + k = 0 will both have real roots, is ______.

  • 4

  • 8

  • 12

  • 16

17.Page 67

If 3 is a root of the quadratic equation x2 – px + 3 = 0, then p is equal to ______.

  • 4

  • 3

  • 5

  • 2

19.Page 67

The solution set for the quadratic equation `2x^2 - x + 1/8 = 0` is ______.

  • `{1/4, 1/4}`

  • `{-1/4, 1/4}`

  • `{-1/2, 1/4}`

  • {4, 4}

20.Page 67

The value/s of ‘k’ for which the quadratic equation 2x2 – kx + k = 0 has equal roots is (are):

  • 0 only

  • 4, 0

  • 8 only

  • 0, 8

21.Page 67

In solving a quadratic equation, one of the values of the variable x is 233.356. The solution rounded to two significant figures is ______.

  • 233.36

  • 233.35

  • 233.3

  • 230

22.Page 67

If the roots of the quadratic equation, px(x – 2) + 6 = 0 are equal, then the value of p is ______.

  • 0

  • 4

  • 6

  • none of these

23.Page 67

If the quadratic equation, `px^2 - 2sqrt(5)px + 15 = 0` has two equal roots, then the value of p is ______.

  • 0

  • 3

  • 6

  • both 0 and 3

24.Page 67

If 1 is a root of the quadratic equation, ky2 + ky + 3 = 0, then the value of k is ______.

  • `-2/3`

  • `-1/3`

  • `-1/2`

  • `-3/2`

25.Page 68

If the equation x2 + 5kx + 16 = 0 has no real roots, then:

  • `k > 8/5`

  • `k < -8/5`

  • `-8/5 < k < 8/5`

  • none of these

26.Page 68

The roots of the quadratic equation 3x2 = 6x is ______.

  • 0

  • 2

  • 0 and 2

  • 0 and 6

27.Page 68

The solution set for the quadratic equation 2x2 + kx – k2 = 0 is ______.

  • {k, k}

  • {–k, k}

  • `{-k, k/2}`

  • `{(-k)/2, k}`

28.Page 68

The solution set for the equation, 25x (x + 1) = – 4, is ______.

  • `{1/5, 4/5}`

  • `{-1/5, 4/5}`

  • `{-4/5, -1/5}`

  • `{-4/5, 1/5}`

29.Page 68

The discriminant of the equation, `3x^2 - 2x + 1/3 = 0` is ______.

  • 0

  • 1

  • 2

  • 4

30.Page 68

The value of the discriminant of the equation, `sqrt(3)x^2 + 10x + 7sqrt(3) = 0` is ______.

  • 4

  • 16

  • –16

  • –12

31.Page 68

The value of the discriminant of the equation, `x^2 - (sqrt(2) + 1)x + sqrt(2) = 0` is ______.

  • `3 + 2sqrt(2)`

  • `1 - 2sqrt(2)`

  • `3 - 2sqrt(2)`

  • `2 - sqrt(2)`

32.Page 68

The value of the discriminant of the equation 2x2 – 3x + 5 = 0, is ______.

  • 31

  • `sqrt(-31)`

  • `sqrt(31)`

  • –31

33.Page 68

If the equation, ax2 + 2x + a = 0 has two real and equal roots, then:

  • a = 0, 1

  • a = 1, 1

  • a = 0, –1

  • a = –1, 1

34.Page 68

The given quadratic equation `3x^2 + sqrt7x + 2 = 0` has ______.

  • two equal real roots.

  • two distinct real roots.

  • more than two real roots.

  • no real roots.

35.Page 68

What is the nature of the roots of the equation, 2x2 – 6x + 3 = 0?

  • rational and unequal

  • irrational and unequal

  • real and equal

  • imaginary and unequal

36.Page 68

The nature of the roots of the equation, `3x^2 - 4sqrt(3)x + 4 = 0` is ______.

  • real and equal

  • irrational and unequal

  • rational and unequal

  • imaginary and unequal

37.Page 68

If –5 is a root of the quadratic equation 2x2 + px – 15 = 0 and the quadratic equation p(x2 + x) + k = 0 has equal roots, then the value of k is ______.

  • `7/4`

  • `5/4`

  • `3/4`

  • `1/4`

III. Analytical and Application Based Questions

1.Page 69

Solve for x, if `5/x + 4sqrt(3) = (2sqrt(3))/x^2, x = 0`

2.Page 69

Determine whether the following quadratic equation has real roots.

5x2 – 9x + 4 = 0

  1. Give reasons for your answer.
  2. If the equation has real roots, identify them.

IV. Case Study Based Questions

1.Page 69

Raman Lal runs a stationery shop in Pune. The analysis of his sales, expenditures and profits showed that for x number of notebooks sold, the weekly profit (in ₹) was P(x) = –2x2 + 88x – 680. Raman Lal found that: 

  • He has a loss if he does not sell any notebook in a week.
  • There is no profit no loss for a certain value x0 of x.
  • The profit goes on increasing with an increase in x i.e. the number of notebooks sold. But he gets a maximum profit at a sale of 22 notebooks in a week.

Now answer the following questions:

1. What will be Raman Lal’s profit if he sold 20 notebooks in a week?

  1. ₹ 144
  2. ₹ 280
  3. ₹ 340
  4. ₹ 560

2. What is the maximum profit that Raman Lal can earn in a week?

  1. ₹ 144
  2. ₹ 288
  3. ₹ 340
  4. ₹ 680

3. What is Raman Lal’s loss if he does not sell any notebooks in a particular week?

  1. ₹ 0
  2. ₹ 340
  3. ₹ 680
  4. ₹ 960

4. Write a quadratic equation for the condition when Raman Lal does not have any profit or loss during a week.

  1. 2x2 – 44x + 340 = 0
  2. x2 + 44x – 340 = 0
  3. x2 – 88x + 340 = 0
  4. x2 – 44x + 340 = 0

5. What is the minimum number of notebooks x that Raman Lal should sell in a week so that he does not incur any loss?

  1. 0
  2. 10
  3. 11
  4. 12

Solutions for 5: Quadratic Equation

EXERCISE 5AEXERCISE 5BEXERCISE 5CCOMPETENCY-FOCUSED QUESTIONS
R.S. Aggarwal solutions for Mathematics [English] Class 10 ICSE chapter 5 - Quadratic Equation - Shaalaa.com

R.S. Aggarwal solutions for Mathematics [English] Class 10 ICSE chapter 5 - Quadratic Equation

Shaalaa.com has the CISCE Mathematics Mathematics [English] Class 10 ICSE CISCE solutions in a manner that help students grasp basic concepts better and faster. The detailed, step-by-step solutions will help you understand the concepts better and clarify any confusion. R.S. Aggarwal solutions for Mathematics Mathematics [English] Class 10 ICSE CISCE 5 (Quadratic Equation) include all questions with answers and detailed explanations. This will clear students' doubts about questions and improve their application skills while preparing for board exams.

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Concepts covered in Mathematics [English] Class 10 ICSE chapter 5 Quadratic Equation are Method of Solving a Quadratic Equation, Nature of Roots of a Quadratic Equation, Concept of Quadratic Equations, Equations Reducible to Quadratic Equations, Factorisation Method, Quadratic Formula (Shreedharacharya's Rule), Method of Solving a Quadratic Equation, Nature of Roots of a Quadratic Equation, Concept of Quadratic Equations, Equations Reducible to Quadratic Equations, Factorisation Method, Quadratic Formula (Shreedharacharya's Rule).

Using R.S. Aggarwal Mathematics [English] Class 10 ICSE solutions Quadratic Equation exercise by students is an easy way to prepare for the exams, as they involve solutions arranged chapter-wise and also page-wise. The questions involved in R.S. Aggarwal Solutions are essential questions that can be asked in the final exam. Maximum CISCE Mathematics [English] Class 10 ICSE students prefer R.S. Aggarwal Textbook Solutions to score more in exams.

Get the free view of Chapter 5, Quadratic Equation Mathematics [English] Class 10 ICSE additional questions for Mathematics Mathematics [English] Class 10 ICSE CISCE, and you can use Shaalaa.com to keep it handy for your exam preparation.

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