SOLUTION: the three roots of x3+2x2-x-2=0

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Question 331825: the three roots of x3+2x2-x-2=0
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
x%5E3%2B2x%5E2-x-2=0
Group terms:
%28x%5E3%2B2x%5E2%29-%28x%2B2%29+=+0
Factor:
x%5E2%28x%2B2%29-%28x%2B2%29+=+0
%28x%2B2%29%28x%5E2-1%29+=+0
%28x%2B2%29%28x-1%29%28x%2B1%29+=+0
.
Roots are:
x ={-2, -1, 1}