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OpenStudy (anonymous):
Simplify. x^2-4x-21 all over x+3
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OpenStudy (anonymous):
\[x^{2}-4x-21 = (x-7)(x+3)\]so, \[(x-7)(x+3) \div (x+3) = (x-7) \] the (x+3) cancel out leaving (x-7)
OpenStudy (anonymous):
thanks
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