An algebraic expression to the power of 2 is called a square formula. The general form of a quadratic equation is ax2 + bx + c = 0, where a, b and c are also real numbers, also called "numerical coefficients," and ≠ 0. Below, x is the unknown variable we need to find the solution. We know that the quadratic formula is used to find the solution (or root) of the quadratic formula calculator ax2 + bx + c = 0.