you will only use the quadratic equation if the polynomial is already simplified and if you can't find other way to factor it.
how to use it.
just plug in every digits in the equation:
x = -b plusminus √(b²-4ac) all over 2a
remember the standard formula of quadratic equation Ax²+Bx+C?
get those coefficients plugged in the quadratic formula and find x.
