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OpenStudy (anonymous):
find the maximum y value f(x)=-x^2+6x+9 please help me solve
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OpenStudy (anonymous):
3
OpenStudy (jziggy):
Using derivatives: f'(x) = -2x + 6 Solve for when it equals zero -2x + 6 = 0 -2x = - 6 x = 3
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