Question

Factorize
(i) ` 5a^2-20ab`
(ii) ` 36a^3b-60a^2bc`
(iii) `5a(b+c)-7b(b+c)`
(iv)` 6(2a+3b)^2-8(2a+3b)`

Answer 1

(i) ` 5a^2--20ab =5a(a-4b)`
(ii) ` 36a^3b-60a^2bc=12a^2b(3a-5c)`.
(iii) ` 5a (b+c) -7b(b+c)=(b+c) (5a-7b)`.
(iv) ` 6(2a+3b)^2-8(2a+3b)=2(2a+3b)[3(2a+3b)-4]=2(2a+3b)(6a+9b-4)`.