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OpenStudy (anonymous):
Solve. x2 + 10x = –21
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OpenStudy (anonymous):
(x+3) (x+7)
OpenStudy (anonymous):
\[x^2+10x+21=0\] \[x^2+7x+3x+21=0\] \[x(x+7)+3(x+7)=0\] \[x+7=0,x+3=0\] \[x=-7,x=-3\]
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