- The definition of a quadratic equation is one in which one of the terms is raised to the second power (squared).
An example of a quadratic equation is 2x² + 4x + 4.

## quadratic equation

Algebra an equation in which the second power, or square, is the highest to which the unknown quantity is raised

## quadratic equation

noun

An equation that employs the variable

*x*having the general form*ax*0, where^{2}+ bx + c =*a, b,*and*c*are constants and*a*does not equal zero; that is, the variable is squared but raised to no higher power.## quadratic equation

Noun

(*plural* quadratic equations)

- (mathematics) a polynomial equation of the second degree.