3 years ago

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

Mathematics

2 answers:

mote1985 [20]3 years ago

7 0

$x_v=-\frac{b}{2a}\\
x_v=-\frac{7}{2\cdot(-9)}\\
x_v=\frac{7}{18}\\$

Verdich [7]3 years ago

4 0

$f(x)=-9x^2+7x+8\\\\a=-9;\ b=7;\ c=8\\\\x_{vertex}=\frac{-b}{2a}\\\\x_{vertex}=\frac{-7}{2\cdot(-9)}=\frac{-7}{-18}=\frac{7}{18}$

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