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OpenStudy (anonymous):
Someone help?...:The vertex of y = 9 - 8x - x2 is (-4, 25) True or False?
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OpenStudy (anonymous):
true...
OpenStudy (nikvist):
\[y=9-8x-x^2=25-16-8x-x^2=25-(4+x)^2\] \[\Rightarrow\quad (-4,25)\,\,is\,vertex\]
OpenStudy (anonymous):
he added 16 for (4+x)^2, that's why he has to subtract 16 again: 25 = 9 - (-16)
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