Advertisements
Advertisements
Question
Use the direct method to evaluate :
(4+5x) (4−5x)
Sum
Advertisements
Solution
Note: (a+b) (a−b) = a2 − b2
(4+5x) (4−5x)
= (4)2 − (5x)2
= 16 − 25x2
shaalaa.com
Is there an error in this question or solution?
APPEARS IN
RELATED QUESTIONS
Expand the following, using suitable identity:
(x + 2y + 4z)2
Expand the following, using suitable identity:
(3a – 7b – c)2
Verify that `x^3+y^3+z^3-3xyz=1/2(x+y+z)[(x-y)^2+(y-z)^2+(z-x)^2]`
What are the possible expressions for the dimensions of the cuboids whose volume is given below?
| Volume : 12ky2 + 8ky – 20k |
Evaluate of the following:
(598)3
If \[x - \frac{1}{x} = \frac{1}{2}\],then write the value of \[4 x^2 + \frac{4}{x^2}\]
If a2 - 5a - 1 = 0 and a ≠ 0 ; find:
- `a - 1/a`
- `a + 1/a`
- `a^2 - 1/a^2`
Evaluate: 203 × 197
If `"a" - 1/"a" = 10;` find `"a" + 1/"a"`
Which one of the following is a polynomial?
