SOLUTION: Simplify if possible: x^2-4x-21 _________ x^2+2x-63

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Question 251443: Simplify if possible:
x^2-4x-21
_________
x^2+2x-63
Answer by oberobic(2304) About Me  (Show Source):
You can put this solution on YOUR website!
%28x%5E2-4x-21%29%2F%28x%5E2%2B2x-63%29
.
Factoring the numerator:
x%5E2+-4x+-21+=+%28x-7%29%28x%2B4%29
.
Factoring the denominator:
x%5E2+%2B2x+-63+=+%28x-7%29%28x%2B9%29
.
The '(x-7)' factors cancel.
.
%28x%2B4%29%2F%28x%2B9%29