Question

factorise 9(x-y)^2-30(x-y)+25​

Answer 1

hey mate!here is your answer.

$let \: p = x - y \\ 9 {(x - y)}^{2} - 30(x - y) + 25 \\ = 9{p}^{2} - 30p + 25 \\ = 9 {p}^{2} - 15p - 15p + 25 \\ = 3p(3p - 5) - 5(3p - 5) \\ =(3p - 5)(3p - 5) \\ = {(3p - 5)}^{2}$

hope it helps you!

please mark it as a branliest answer.