Question

Some steps to rewrite the expression x3 − 4x + x2 − 4 as a product of three factors are shown below:

Answer 1

Its the first on A 100% positive i just did this and got it right hope i helped!<span />

Answer 2

I know step 5 is (x-2)(x+2)(x+1)
But I don't know what step 4 is. 
Im stuck.