Question

use a suitable identity to get each of the following products (2x-7)²​

Answer 1

(a – b)2 = a2 – 2ab + b. a2 – b2 = (a + b)(a – b) (x + a)(x + b) = x2 + (a + b) x + ab. (a + b + c)2 = a2 + b2 + c2 + 2ab + 2bc + 2ca.

Answer 2

Answer : Using the identity

(a - b)² = a²-2ab+b²

we have

(2x-7)² = (2x)² - 2(2x)(7) + (7)²

=> 4x²-28x+49

Hope this helps....