Question

The equation and graph of a polynomial are shown below. The graph reaches its maximum when the value of x is 3. What is the y-value of this maximum? y=-x+6x-8

Answer 1

The maximum value of y is

$Y=x^2+6x-8$$y=(3)^2+6(3)-8$$\begin{gathered} y=\text{ 9+18-8} \\ y=19 \end{gathered}$

So, the maximum value of y when x=3 is 19