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Select the x-coordinate of the vertex of the parabola defined by the function f(x)=-9x^2+7x+8

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[tex]f(x)=-9x^2+7x+8\\\\a=-9;\ b=7;\ c=8\\\\x_{vertex}=\frac{-b}{2a}\\\\x_{vertex}=\frac{-7}{2\cdot(-9)}=\frac{-7}{-18}=\frac{7}{18}[/tex]
konrad509
[tex]x_v=-\frac{b}{2a}\\ x_v=-\frac{7}{2\cdot(-9)}\\ x_v=\frac{7}{18}\\[/tex]

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