Question

18. Factorise the following expressions:
(1) 7(x + 2y)2 - 25(x + 2y) + 12​

Answer 1

Step-by-step explanation:

Let (X+2y) be a

Then, the expression

7a^2 - 25a +12

7a^2 - 21a -4a+12

7a(a-3) -4(a -3)

(7a -4)(a-3)

Putting a = X+2y

(7x +14y - 4)(X + 2y -3)