Question

Resolve into factors pls do it fast. i) 9(a+b)² - 25c² . ii)(a-5)² - 36 . iii)4x² - 81(y+z)² pls fast​

Answer 1

Solution

(i)

9(a+b)² - 25c²

={3(a+b)}²-(5c)²

=(3a+3b+5c)(3a+3b-5c)

(ii)

(a-5)² - 36

=(a-5)²-6²

=(a-5+6)(a-5-6)

=(a+1)(a-11)

(iii)

4x² - 81(y+z)²

=(2x)²-{9(y+z)}²

=(2x+9y+9z)(2x-9y-9z)

Hope this helps you...khus rhe