In mathematics, a quadratic equation is a univariate polynomial equation of the second degree. A general quadratic equation can be written in the form

ax^2+bx+c=0,\,

where x represents a variable or an unknown, and a, b, and c are constants with a ≠ 0. (If a = 0, the equation is a linear equation.)

The constants a, b, and c are called respectively, the quadratic coefficient, the linear coefficient and the constant term or free term. The term "quadratic" comes from quadratus, which is the Latin word for "square". Quadratic equations can be solved by factoring, completing the square, graphing, Newton's method, and using the quadratic formula

"Basic Quadratic Equations" has some set of solved quadratic equations step-by-step. It has the following 4 equations solved,
- Quadratic Equation
- Monic Equation
- Square Root
- Complete the Square