Advertisements
Advertisements
Question
Find the value of a, if 9a = 762 – 672
Advertisements
Solution
We have,
9a = 762 – 672
⇒ 9a = (76 + 67)(76 – 67) ...[Using the identity, a2 – b2 = (a + b)(a – b)]
⇒ 9a = 143 × 9
⇒ `a = (143 xx 9)/9`
⇒ a = 143
APPEARS IN
RELATED QUESTIONS
Expand: (3x + 4y)(3x - 4y)
Using suitable identities, evaluate the following.
9.8 × 10.2
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
x2 – 9
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
`(2p^2)/25 - 32q^2`
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
x4 – 1
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
y4 – 625
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
(x + y)4 – (x – y)4
Factorise the expression and divide them as directed:
(2x3 – 12x2 + 16x) ÷ (x – 2)(x – 4)
The base of a parallelogram is (2x + 3 units) and the corresponding height is (2x – 3 units). Find the area of the parallelogram in terms of x. What will be the area of parallelogram of x = 30 units?
Verify the following:
`((3p)/7 + 7/(6p))^2 - (3/7p + 7/(6p))^2 = 2`
