<s>[INST] Convert standard form to factor form Im so confused now 
I have no idea how to factor a standard form
i have example shown below
Standard form
$$x^4+6x^3-x^2-6x$$
Factor form
$$x(x+6)(x+1)(x-1)$$
Can you explain a little bit 
I have no idea
Thank you
 [/INST] $$x^4+6x^3-x^2-6x=x^4-x^2+6x^3-6x=x^2(x^2-1)+6x(x^2-1)=$$ $$(x^2-1)x(x+6)=(x-1)(x+1) x(x+6)=x(x-1)(x+1)(x+6).$$
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