Definition:Quadratic

Definition

The word quadratic describes an expression or an equation involving the square of a given quantity.

Quadratic Polynomial

A quadratic polynomial is a polynomial of degree $2$.

Quadratic Equation

A quadratic equation is a polynomial equation of the form:

$a x^2 + b x + c = 0$

such that $a \ne 0$.

Also known as

An older word for quadratic is quadric, but this is rarely seen nowadays.

Also see

• Results about quadratics can be found here.

Sources

• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): quadratic (quadric)
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): quadratic