SOLUTION: What is the maximum y value for f(x)= -x^2+8x+9 Thanks!

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Question 762050: What is the maximum y value for f(x)= -x^2+8x+9
Thanks!
Answer by tommyt3rd(5050) About Me  (Show Source):
You can put this solution on YOUR website!
Vertex Formula:
x%5Bmax%5D=-b%2F%282a%29=%28-8%29%2F%282%28-1%29%29=4

y%5Bmax%5D=-%284%29%5E2%2B8%284%29%2B9=25%0D%0A