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OpenStudy (anonymous):
How many solutions are there for the equation? x2 + 9x = -7? A. 2 B. 1 C. 0
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OpenStudy (anonymous):
answer is A. use formula ax^2+bx+c=0 where \[x=\left(\begin{matrix}-b+\sqrt{b ^{2}-4ac} \\ 2\end{matrix}\right)\]
OpenStudy (anonymous):
there is - also, at the bottom of the +
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