factorise (a) 7 (x-2y)^2 - 25 (x-2y)+12 (b) 9 (2a-b)^2 - 4 (2a-b) - 13 (c) (x^2- 2x)^2 -23 (x^2-2x)+120 - Maths - Polynomials

Question

factorise (a) 7 (x-2y)^2 - 25 (x-2y)+12 (b) 9 (2a-b)^2 - 4 (2a-b) -
13 (c) (x^2- 2x)^2 -23 (x^2-2x)+120

Swagat Swargari · Accepted Answer

9(2a-b)2 - 4(2a-b) - 13
= 9(2a-b)2 + 9(2a-b) - 13(2a-b) - 13
= 9(2a-b){(2a-b) + 1} - 13{(2a-b) + 1}
= {9(2a-b) - 13}{(2a-b) + 1}