## Functions Modeling Change: A Preparation for Calculus, 5th Edition

$$q=\frac{-2+\sqrt{30}}{2},\:q=\frac{-2-\sqrt{30}}{2}$$
Using the quadratic formula, we find: $$q=\frac{-4\pm \sqrt{4^2-4\cdot \:2\left(-13\right)}}{2\cdot \:2} \\ q=\frac{-2+\sqrt{30}}{2},\:q=\frac{-2-\sqrt{30}}{2}$$