Factorize:

x³+x-3x²-3

2

Factorize:

a(a+b)3-3a²b(a+b)

3

Factorize:

x(x³–y³)+3xy-(x–y)

4

Factorize:

a²x²+(ax²+1)x+a

5

Factorize:

x²+y-xy-x