What is the quadratic formula?

x = [−b ± √(b2 − 4ac)]/2a

A, B, and C can all correspond to the original quadratic equation as follows: ax2 + bx + c = 0

The quadratic formula can only be used if the quadratic equation is equal to zero.
If [ Ax2 + Bx + C = 0 ], then

x = [ -B +/- sqrt( B2 - 4AC ) ]/ 2A