# Quadratic Equations

## What Is a Quadratic Equation?

A quadratic equation is a type of equation. A quadratic equation is in the form:**a**,

**b**and

**c**are constants that stand in for particular numbers.

**x**is a variable and can take any number. The highest power of

**x**in a quadratic equation is

**2**. It has an

**x**term. Here is an example of a quadratic equation:

^{2}A quadratic equation shows a curve when plotted on a graph. Here is the quadratic equation above plotted on a graph:

## Dictionary Definition

The Oxford English Dictionary defines a quadratic equation as "an equation of the second degree; specifically an equation of the form*ax*, where

^{2}+ bx + c = 0*a*,

*b*, and

*c*are constants and

*x*is unknown."

## Where Does the Word Quadratic Come From?

The word "quadratic" comes from the word "quad", meaning "square" - because the**x**is squared.

## The Curriculum

The lessons are grouped into mini-curriculum to help you organise your learning. A brief description is given for each mini-curriculum. Click the**MORE**button to learn more.

## Quadratic Equations

Quadratic equations are equations where

**x**is the highest power of^{2}**x**. Quadratic equations show curves when plotted. In this mini-curriculum, you will learn about quadratic equations.## Solving Quadratic Equations

Solving a quadratic equation means finding the value of

**x**that make the equation equal to 0. There are different ways to solve quadratic equations. In this mini-curriculum, you will learn how to solve quadratic equations.## Difference of Squares

A difference of squares is one squared quantity (a number or letter multiplied by itself) subtracted from another squared quantity.
Some quadratic equations are in the form of a difference of squares. They can be factored and solved in an easy way.
In this mini-curriculum, you will learn about the difference of squares.

## Completing the Square

Completing the square is a way of writing a quadratic equation.
In this mini-curriculum, you will learn about completing the square.