# What do you need to do if you are asked to expand a single bracket in maths?

To expand a single bracket in math all you need to do is multiply the term on the outside of the bracket by the terms inside the bracket. It’s important that you know how to expand a bracket so that you can simplify expressions or solve harder equations. A couple of things to remember when expanding brackets are:

1) Make sure the letters are in alphabetical order, for example, 3d × 5c = 15cd

2) If you multiply a letter by itself it will become squared, for example, 7y × 3y = 21y²

Let’s take a look at a few examples that involve expanding brackets:

**Example 1**

Expand the bracket 6(2a + 3)

The 6 has to multiply both terms inside the bracket:

6 × 2a = 12a

6 × 3 = 18

So if you put these together on one line your final expression will be:

12a + 18

**Example 2**

Expand the bracket 4(9x + 3)

The 4 has to multiply both terms inside the bracket:

4 × 9x = 36x

4 × 3 = 12

So if you put these together on one line your final expression will be:

36x + 12

**Example 3**

Expand the bracket 7(6y - 4p)

The 7 has to multiply both terms inside the bracket:

7 × 6y = 42y

7 × -4p = -28p

So if you put these together on one line your final expression will be:

42y – 28p

**Example 4**

Expand the bracket 8d(3e + 5a)

This time you have 8d at the front of the bracket and this term must multiply both terms inside the bracket:

8d × 3e = 24de

8d × 5a = 40ad

So if you put these together on one line your final expression will be:

24de + 40ad

**Example 5**

Expand the bracket x(7x - y)

This time you have x at the front of the bracket and this term must multiply both terms inside the bracket:

x × 7x = 7x²

x × -y =- xy

So if you put these together on one line your final expression will be:

7x² -xy

**Example 6**

Expand the bracket 3x(2x + 7y)

This time you have 3x at the front of the bracket and this term must multiply both terms inside the bracket:

3x × 2x = 6x²

3x × 7y =21xy

So if you put these together on one line your final expression will be:

6x² + 21xy

**Example 7**

Expand the bracket 9d(d – 7de)

This time you have 9d at the front of the bracket and this term must multiply both terms inside the bracket:

9d × d = 9d²

9d × -7de = -63d²e

So if you put these together on one line your final expression will be:

9d² -63d²e

**Example 8**

Expand the bracket 5y(2x + y – 8z)

This time you have 5y at the front of the bracket and this term must multiply all of the 3 terms inside the bracket:

5y × 2x = 10xy

5y × y = 5y²

5y × -8z = -40yz

So if you put these together on one line your final expression will be:

10xy + 5y² - 40yz

## More help with brackets.

- A simple method to factorise an expression into a do...

Expressions of the form x + bx + c can be factorised into a double bracket. Basically you are looking for two numbers that multiply to give c and add to give b. Question 1 on double bracket factorisation... - Expanding double brackets. Step by step guide on how...

In the examples shown below we shall be expanding (multiplying out) double brackets. Be careful with the signs before the terms in the brackets. Example 1 Expand and simplify (x+2)(x-5) Multiply the...

## More by this Author

- 0
The density, mass and volume triangle is as follows: So if you wanted to work out the density, you would cover up density in the magic triangle to give: Density = Mass/Volume (since mass is above volume) So if...

- 14
Finding the nth term of a decreasing linear sequence can by harder to do than increasing sequences, as you have to be confident with your negative numbers. A decreasing linear sequence is a sequence that goes down...

- 0
The surface area of a triangular prism can be found in the same way as any other type of prism. All you need to do is calculate the total area of all of the faces. A triangular prism has 5 faces, 3 being rectangular and...

## Comments

No comments yet.