# SOLUTION: Find the maximum y value on the graph of y=f(x) f(x)=-x^2+8x+1

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 Click here to see ALL problems on Rational-functions Question 630632: Find the maximum y value on the graph of y=f(x) f(x)=-x^2+8x+1Found 2 solutions by reviewermath, stanbon:Answer by reviewermath(604)   (Show Source): You can put this solution on YOUR website!The x-coordinate of the vertex is and the y-coordinate is . Since a < 0, y = f(x) has a maximum value. The maximum value is . The graph is Answer by stanbon(57967)   (Show Source): You can put this solution on YOUR website!Find the maximum y value on the graph of y=f(x) f(x)=-x^2+8x+1 --- Max occures when x = -b/(2a) = -8/(2*-1) = 4 --- Max y-value = f(4) = -4^2+8*4+1 = -16 + 32 + 1 = 17 -------------------- Cheers, Stan H. =================