# Question #22f0d

$- 9$
The average rate of change of $f \left(x\right) = {x}^{2} - 8 x + 15$ on $- 3 \le x \le 2$ is:
$\frac{f \left(2\right) - f \left(- 3\right)}{2 - \left(- 3\right)} = \frac{3 - 48}{5} = - \frac{45}{5} = - 9$