f(x)=-1/2x^2+7x-2. x=7. Im trying to find the vertex, one is 7, and the other is 45/2. I keep getting 49/2. what am I missing?

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what does "one is 7" mean?

first coordinate of the vertex is always \(-\frac{b}{2a}\)
in your case \(a=-\frac{1}{2},b=7\)

ooh i see "one is 7" means the first coordinate is 7

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