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OpenStudy (anonymous):
x^2+10x=-21
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OpenStudy (anonymous):
x^2 + 10x + 21 = 0 (x + 3)(x + 7) = 0 x + 3 = 0 x = -3 x + 7 = 0 x = -7 x = -3, -7
OpenStudy (anonymous):
\[x^2+10x=-21\] \[(x+5)^2=-21+5^2=-21+25=4\] \[x+5=2\] or \[x+5=-2\] \[x=-3\] or \[x=-7\]
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