SOLUTION: Find the maximum value of y = -x^2 + 6x. The answer I got was 8 but it was not correct.

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Question 60369This question is from textbook
: Find the maximum value of y = -x^2 + 6x. The answer I got was 8 but it was not correct. This question is from textbook

Answer by 303795(602) About Me  (Show Source):
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The maximum value will be on the line of symmetry for the equation is found using the formula LOS+=+-b%2F2a where a is the x squared coefficient and b is the x coefficient.
LOS+=+-6%2F2%28-1%29+=+3
This means that the maximum y value occurs when the x value is 3. Substitute x =3 in the original equation.
y+=+-3%5E2+%2B+6%2A3=-9%2B18=9