# Algebra

Algebra – Substitutes letters for numbers.

It deals with symbols and the rules.

The **owl with a bra** (**algebra**) was the **substitute** for one of the footballers with a **letter **on their shirt.

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**Example 1**

One of the most famous algebraic expressions is:

`E=mc^2`

The letters `E` (energy) and `m` (mass) are variables and the letter `c` is the speed of light which is a constant.

**Example 2**

`ax^2+bx+c=0`

A famous algebraic equation is the quadratic equation.

## Remember Algebra

Another way to help you remember that algebra is substituting letters for numbers is as follows:

Along with being a footballer she’s always having problems in the papers with her eX’s (X).