Factorization (1) 16-24 (a + b) + 9 (a + b) ^ 2 (2) (X-Y) ^ 2-4 (x-y-1) (3) m (X-Y) ^ 2-x + y (4) 9 (a-b) ^ 2-16 (a + b) ^ 2

Factorization (1) 16-24 (a + b) + 9 (a + b) ^ 2 (2) (X-Y) ^ 2-4 (x-y-1) (3) m (X-Y) ^ 2-x + y (4) 9 (a-b) ^ 2-16 (a + b) ^ 2

1 original formula = 4 ^ 2-24 (a + b) + [3 (a + b)] ^ 2
=[4-(a+b)]^2
2=(x-y)^2-4(x-y)+4
=[(x-y)-2]^2
I can't understand the question
4=[3(a-b)]^2-[4(a+b)]^2
=[3(a-b)+4(a+b)][3(a-b)-4(a+b)]
=(7a+b)(-a-7b)