Homework Help: college algebra

Posted by Zura on Sunday, December 2, 2012 at 6:57am.

Need help finding the x-intercepts
y=x^3+x^2-100x-100
I know that the answer is (10,0),(-10,0),(-1,0) I don't understand how to get (-10,0) and (10,0)

college algebra - Steve, Sunday, December 2, 2012 at 7:25am
if you rearrange things a bit, you see

x^3-100x + x^2-100
= x(x^2-100) + 1(x^2-100)
= (x+1)(x^2-100)
= (x+1)(x-10)(x+10)

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