## Calculus with Applications (10th Edition)

The graph of the quadratic function $f(x)=ax^{2}+bx+c$ is a parabola with its vertex at $(\displaystyle \frac{-b}{2a}, f(\displaystyle \frac{-b}{2a}))$. $....................................$ Here, the vertex has x-coordinate: $x=-\displaystyle \frac{b}{2a}=-\frac{-6}{2(1)}=3.$ The statement is true.