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OpenStudy (anonymous):
solve by completing the square x^2+4x-21=0
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OpenStudy (anonymous):
\[x^2+4x-21=0\]\[x^2+4x=21\]\[x^2+4x+4=21+4\]\[(x+2)^2=25\]\[x+2=\pm5\]\[x=-3\]or\[x=7\]
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