Chapter 2, Problem 5P

The voltage across the capacitor shown in Fig. P2.5 is given by the quadratic equation $v\left(t\right)=t^2-6t$. Find t when

1. $v\left(t\right)=16\text{ V}$ (use the quadratic formula), and $v\left(t\right)=27\text{ V}$ (use completing the square).