Answer:
4y^2-24y+36
Step-by-step explanation:
Expand the expression to simplify, which you do by using the FOIL method, then combining like terms.
(a-b)(a-b) = a^2 - 2ab + b^2
(2y-6)^2
= (2y-6)(2y-6)
= 4y^2 - 12y + 36
