Question: This is not from a test. It's a unit review to prepare for the test. f(x)=-2x^2+28x+10 I am supposed to find the vertex. I know

This is not from a test. It's a unit review to prepare for the test.

f(x)=-2x^2+28x+10

I am supposed to find the vertex. I know that it is (7,108), but I don't know where the 108 came from. I only came up with the 7. Can you point me in the right direction?

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