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More Lessons for GCSE Maths

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Examples, solutions, and videos to help GCSE Maths students learn how to expand algebraic expression by expanding double brackets (binomials).

**Expanding Double Brackets**

When expanding double brackets, we need to remember that in algebra when two things are next to each other it means they are multiplied.

(x - 5)(x + 3) is the same as (x - 5) × (x + 3).

So we need to multiply everything in the second bracket by everything in the first bracket.

There are 2 different methods.

In the first method, we draw arcs linking each term in the first bracket to each term in the 2nd bracket.

So x multiplied by x is x squared, x multiplied by 3 is 3x, -5 multiplied by x is -5x, and -5 multiplied by 3 is -15.

We end up with 4 arcs; that’s really important - to make sure that we did not accidentally miss any.

Some people like to remember this as FOIL: First, Outer, Inner, Last.

In the second method, we split up each bracket into a grid and then just multiply each bit together.

For both methods, we then then simplify the middle terms by 3x - 5x = -2x, so the final answer is x2 - 2x - 15.

For triple brackets: start by expanding the first two brackets and then multiply that answer by the third bracket.

**Quadratics - Expanding Double Brackets**

An introduction to expanding brackets as required for Module 8 Unit 8 of the OCR mathematics GCSE course. Some sample questions for you to try and worked examples and solutions.

**Expanding double brackets**

How to work out (expand) double brackets in algebra.
**Multiplying two brackets**

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

More Lessons for GCSE Maths

Math Worksheets

Examples, solutions, and videos to help GCSE Maths students learn how to expand algebraic expression by expanding double brackets (binomials).

When expanding double brackets, we need to remember that in algebra when two things are next to each other it means they are multiplied.

(x - 5)(x + 3) is the same as (x - 5) × (x + 3).

So we need to multiply everything in the second bracket by everything in the first bracket.

There are 2 different methods.

In the first method, we draw arcs linking each term in the first bracket to each term in the 2nd bracket.

So x multiplied by x is x squared, x multiplied by 3 is 3x, -5 multiplied by x is -5x, and -5 multiplied by 3 is -15.

We end up with 4 arcs; that’s really important - to make sure that we did not accidentally miss any.

Some people like to remember this as FOIL: First, Outer, Inner, Last.

In the second method, we split up each bracket into a grid and then just multiply each bit together.

For both methods, we then then simplify the middle terms by 3x - 5x = -2x, so the final answer is x

For triple brackets: start by expanding the first two brackets and then multiply that answer by the third bracket.

An introduction to expanding brackets as required for Module 8 Unit 8 of the OCR mathematics GCSE course. Some sample questions for you to try and worked examples and solutions.

How to work out (expand) double brackets in algebra.

Rotate to landscape screen format on a mobile phone or small tablet to use the **Mathway** widget, a free math problem solver that **answers your questions with step-by-step explanations**.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

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