how to factor

Question

x^4 - 2x^3 - 8x + 16

Thanks.

you can factor by grouping wich is to divide the equation into two pieces
1)x^4-2x^3 -8x+16
2)now factor this two
x^3(x-2)-8(x-2)
3)you will get x^3-8 and x-2
4)factor x^3-8