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Secondary School (English Medium) (5 to 8) Class 8 - CBSE Question Bank Solutions

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Find the product.

(x + 7y) (7x − y)

[8] Algebraic Expressions and Identities
Chapter: [8] Algebraic Expressions and Identities
Concept: undefined >> undefined

Find the product.

(a2 + b) (a + b2)

[8] Algebraic Expressions and Identities
Chapter: [8] Algebraic Expressions and Identities
Concept: undefined >> undefined

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Find the product.

(p2 − q2) (2p + q)

[8] Algebraic Expressions and Identities
Chapter: [8] Algebraic Expressions and Identities
Concept: undefined >> undefined

Draw the graphs for the following tables of values, with suitable scales on the axes.

Cost of apples

Number of apples 1 2 3 4 5
Cost (in ₹) 5 10 15 20 25
[13] Introduction to Graphs
Chapter: [13] Introduction to Graphs
Concept: undefined >> undefined

Draw the graphs for the following tables of values, with suitable scales on the axes.

Distance travelled by a car

Time (in hours) 6 a.m.  7 a.m. 8 a.m. 9 a.m.
Distance (in km) 40 80 120 160 
  1. How much distance did the car cover during the period 7.30 a.m. to 8 a.m.?
  2. What was the time when the car had covered a distance of 100 km since it's start?
[13] Introduction to Graphs
Chapter: [13] Introduction to Graphs
Concept: undefined >> undefined

Draw the graphs for the following tables of values, with suitable scales on the axes.

Interest on deposits for a year:

Deposit (in Rs) 1000 2000 3000 4000 5000
Simple interest (in Rs) 80 160 240 320 400
  1. Does the graph pass through the origin?
  2. Use the graph to find the interest on Rs 2500 for a year:
  3. To get an interest of Rs 280 per year, how much money should be deposited?
[13] Introduction to Graphs
Chapter: [13] Introduction to Graphs
Concept: undefined >> undefined

Draw a graph for the following:

Side of square (in cm) 2 3 3.5 5 6
Perimeter (in cm) 8 12 14 20 24

Is it a linear graph?

[13] Introduction to Graphs
Chapter: [13] Introduction to Graphs
Concept: undefined >> undefined

Draw a graph for the following:

Side of square (in cm) 2 3 4 5 6
Area (in cm2) 4 9 16 25 36

Is it a linear graph?

[13] Introduction to Graphs
Chapter: [13] Introduction to Graphs
Concept: undefined >> undefined

Multiply the monomial by the binomial and find the value for x = −1, y = 0.25 and z = 0.05: 15y2(2 − 3x)

[8] Algebraic Expressions and Identities
Chapter: [8] Algebraic Expressions and Identities
Concept: undefined >> undefined

Multiply the monomial by the binomial and find the value for x = −1, y = 0.25 and z = 0.05: −3x(y2 + z2)

[8] Algebraic Expressions and Identities
Chapter: [8] Algebraic Expressions and Identities
Concept: undefined >> undefined

Multiply the monomial by the binomial and find the value for x = −1, y = 0.25 and z = 0.05: z2(x − y)

[8] Algebraic Expressions and Identities
Chapter: [8] Algebraic Expressions and Identities
Concept: undefined >> undefined

Multiply the monomial by the binomial and find the value for x = −1, y = 0.25 and z = 0.05:

xz(x2 + y2)

[8] Algebraic Expressions and Identities
Chapter: [8] Algebraic Expressions and Identities
Concept: undefined >> undefined

Find the product of the following binomial: (2x + y)(2x + y)

[8] Algebraic Expressions and Identities
Chapter: [8] Algebraic Expressions and Identities
Concept: undefined >> undefined

Find the product of the following binomial:  (a + 2b)(a − 2b)

[8] Algebraic Expressions and Identities
Chapter: [8] Algebraic Expressions and Identities
Concept: undefined >> undefined

Find the product of the following binomial:  (a2 + bc)(a− bc)

[8] Algebraic Expressions and Identities
Chapter: [8] Algebraic Expressions and Identities
Concept: undefined >> undefined

Find the product of the following binomial: \[\left( \frac{4x}{5} - \frac{3y}{4} \right)\left( \frac{4x}{5} + \frac{3y}{4} \right)\]

[8] Algebraic Expressions and Identities
Chapter: [8] Algebraic Expressions and Identities
Concept: undefined >> undefined

Find the product of the following binomial: \[\left( 2x + \frac{3}{y} \right)\left( 2x - \frac{3}{y} \right)\]

[8] Algebraic Expressions and Identities
Chapter: [8] Algebraic Expressions and Identities
Concept: undefined >> undefined

Find the product of the following binomial: (2a3 + b3)(2a3 − b3)

[8] Algebraic Expressions and Identities
Chapter: [8] Algebraic Expressions and Identities
Concept: undefined >> undefined

Find the product of the following binomial: \[\left( x^4 + \frac{2}{x^2} \right)\left( x^4 - \frac{2}{x^2} \right)\]

[8] Algebraic Expressions and Identities
Chapter: [8] Algebraic Expressions and Identities
Concept: undefined >> undefined

Find the product of the following binomial: \[\left( x^3 + \frac{1}{x^3} \right)\left( x^3 - \frac{1}{x^3} \right)\]

[8] Algebraic Expressions and Identities
Chapter: [8] Algebraic Expressions and Identities
Concept: undefined >> undefined
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