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OpenStudy (anonymous):
The standard form of the equation of a parabola is y=1/2x^2-4x+21. What is the vertex form of the equation? A) y=1/2(x+4)^2+21 B)y=1/2(x-4)^2+21 C)y=1/2(x-4)^2+13 D)y=1/2(x+4)^2+13
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OpenStudy (anonymous):
seems unlikely it is A or D replace \(x\) by \(4\) and see if you get \(13\) or \(21\)
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