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OpenStudy (stevetron):
1. Simplify the rational expression. x^2+4x-21 ---------- x^2+x-42 a.x+3/x+6 b.x-3/x-6 c.x-3/x+7 d.x+7/x+6
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OpenStudy (anonymous):
factor the denominator and numerator. Once you factor both terms cancel out any similar terms that appear in both the top and bottom.
OpenStudy (stevetron):
ok, so b
OpenStudy (anonymous):
the top becomes (x+7)(x-3) the bottom (x+7)(x-6) so yeah b
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