SOLUTION: factor the expressions completely: x^4+4x^3-45x^2 x^3+2x^2-4x-8 please solve these tow question soon thankz

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Question 446581: factor the expressions completely:
x^4+4x^3-45x^2
x^3+2x^2-4x-8
please solve these tow question soon
thankz
Answer by chriswen(106) About Me  (Show Source):
You can put this solution on YOUR website!
x%5E4%2B4x%5E3-45x%5E2
=x%5E2%28x%5E2%2B4x-45%29
=x%5E2%28x%2B9%29%28x-5%29
...
x%5E3%2B2x%5E2-4x-8
=%28x%5E3%2B2x%5E2%29-%284x%2B8%29
=x%5E2%28x%2B2%29-4%28x%2B2%29
=%28x%5E2-4%29%28x%2B2%29
=%28x%2B2%29%28x-2%29%28x%2B2%29
=%28x%2B2%29%5E2%2A%28x-2%29
...
I think I recognize these from somewhere.