Question

1)a^2-b^2-a+b
2)x^3-x^2y-xy^2+y^3

Answer 1

a²-b²-a+b=(a²-b²)-(a-b)=(a-b)(a+b-1)
x³-x²y-xy²+y³=x²(x-y)-y²(x-y)=(x-y)(x-y)(x+y)