This is a Quadratic Equation:
(a, b, and c can have any value, except that a can't be 0.)
The letters a, b and c are the coefficients (you know these)
The letter "x" is the variable or unknown (you don't know it yet)
The name Quadratic comes from "quad" meaning square, because the highest exponent is a square.
Quadratic equations can be solved using a special formula called the Quadratic Formula: