Answer
$$t=-3,-1.5$$
Work Step by Step
We first check that the function is in the form $ax^2+bx+c$. Then, using the quadratic formula, we obtain:
$$t=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$$
$$t=\frac{-9\pm \sqrt{(9)^2-4(2)(9)}}{2(2)}$$
$$t=-3,-1.5$$
