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OpenStudy (anonymous):
The vertex of y = 9 - 8x - x2 is (-4, 25) True False
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OpenStudy (anonymous):
it's true because you substitute x with -4 and y is 25 after solving it you get 25 so it's true
OpenStudy (precal):
That is not why it is the vertex. That is why the point is on the parabola or function. Use the vertex formula.
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