Question

factorize:- 4(x+y)²-12(x²-y²)+9(x-y)²

Answer 1

by observation,
4(x+y)²-12(x²-y²)+9(x-y)²
(2(x+y))²-2*(2(x+y))(3(x-y))+(3(x-y))²
(2x+2y-(3x-3y))²
(5y-x)²

Answer 2

Answer is in the image