Question

(5x-2y)^2-9y^2
Помогитееее

Answer 1

(5x-2y)² - 9y² =(5x-2y)² - (3y)² =(5x-2y-3y)(5x-2y+3y)=(5x-5y)(5x+y)=
=5(x-y)(5x+y)