I wasn't really paying attention in class, and im having trouble. Heres the question:

For each quadratic equation, find: a) the sum of its roots and b) the product of its roots

$\displaystyle x^2-2x-15=0$

Ik in order to find the sum of the roots you need to do:$\displaystyle \frac{-b}{a}$ and for the product:$\displaystyle \frac{c}{a}$