Question

Factor if possible
81x^2 - 36xy+ 4y^2

Answer 1

so0 first off let's factor out a common term...

(9x - 2y)(9x - 2y)

if we expand this out we will get

81x^2 - 18xy -18xy + 4y^2 which is your expression.

so we can write this further as

(9x - 2y)^2