SOLUTION: Factor by grouping x^3+5x^2-3x-15 Thank you

Question 324491: Factor by grouping
x^3+5x^2-3x-15

Thank you
Found 2 solutions by checkley77, unlockmath:
Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
x^3+5x^2-3x-15
x^2(x+5)-3(x+5)
(x^2-3)(x+5) ans.
Answer by unlockmath(1688) (Show Source): You can put this solution on YOUR website!
Hello,
We can rewrite this x^3+5x^2-3x-15 as:
x^2(x+5)-3(x+5)
Now we can rewrite it as:
(x^2-3)(x+5)
Got it?
This can be checked by multiplying it out and get the original expression.
RJ
www.math-unlock.com
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