SOLUTION: x^3 + 2x^2 - x -2 = 0

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Question 183847: x^3 + 2x^2 - x -2 = 0
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
Solve for x:
x%5E3%2B2x%5E2-x-2+=+0 Factor the left side.
%28x%5E2-1%29%28x%2B2%29+=+0 Apply the zero product rule:
x%5E2-1+=+0 or x-2+=+0 so...
x%5E2-1+=+0 Add 1 to both sides.
x%5E2+=+1 Take the square root of both sides.
x+=+1 or x+=+-1 and...
x%2B2+=+0 Subtract 2 from both sides.
x+=+-2
The solutions:
highlight%28x+=+1%29
highlight%28x+=+-1%29
highlight%28x+=+-2%29