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OpenStudy (anonymous):
The vertex of y = 9 - 8x - x2 is (-4, 25) True False
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OpenStudy (anonymous):
True
OpenStudy (mertsj):
\[x=\frac{8}{-2}=-4\] y=9-8(-4)-(-4)^2=9+32-16=25
OpenStudy (anonymous):
If you are not convinced by the good solution of @Mertsj , see the attached graph.
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