Posted by Allison A on Thursday, November 24, 2011 at 9:38pm.
Look at the function.
(x-8)^2 is always positive. Its least value is where x=8, when it is zero.
However, you have -(x-8)^2, so it has a maximum value at x = 8.
So, the vertex is obviously where x=8. That means that the vertex is (8,f(8)) = (8,-2)
The y-value at the vertex is the maximum or minimum value.
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