Question

Factorise (x - y)^2 - 3(x - y)

Answer 1

can you factor this: \(\large a^2-3a \) ???

Answer 2

Yes? a(a-3)

Answer 3

good. so now you know how to factor your orginal problem if you let a=(x-y).
Just replace the "a" with "(x-y)"

Answer 4

Would the answer be (x - y)(x - y - 3)?