4(a-b)^2-(a+b)^216(a+b)^2-9(x+y)^2

Question

4(a-b)^2-(a+b)^2
16(a+b)^2-9(x+y)^2

Answer 1

(2(a-b)+(a+b))(2(a-b)-(a+b))=(2a-2b+a+b)(2a-2b-a-b)=(3a-b)(a-3b)

(4(a+b)+3(x+y))(4(a+b)-3(x+y))