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OpenStudy (goblingnaw89):
whats the vertex of y=4x^2-8x-7?
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sam (.sam.):
\[-\frac{b}{2a}\]
sam (.sam.):
\[x=-\frac{b}{2a} \\ \\ x=\frac{8}{2(4)} \\ \\ x=1\] Now, use x=1 plug it back into the equation y=4x^2-8x-7 to find 'y'
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