pls I need help to solve this:

Question

9(y-1)^2-25

Answer 1

I assume you're supposed to factor the expression?

Recall that a^2 - b^2 = (a+b)(a-b)

You have

(3(y-1))^2 - 5^2
= (3(y-1)+5)(3(y-1)-5)
= (3y+2)(3y-8)