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Algebraic expressions - OCRFactorising

Letters can be used to stand for unknown values or values that can change. Formulas can be written and equations solved to solve a range of problems in science and engineering.

Part ofMathsAlgebra

Factorising

Click to explore updated revision resources for GCSE Maths: Factorising expressions, with step-by-step slideshows, quizzes, practice exam questions, and more!

Factorising is the opposite process of expanding brackets. A factorised answer will always contain a set of brackets.

To factorise an expression fully, start by finding the of all the terms. For example, \(2x\) is the HCF of \(4x^2\) and \(6x\) as 2 is the largest number that will divide into both 4 and 6 and \(x\) is the largest power that will divide into \(x^2\) and \(x\).

Example

Factorise \(6x + 9\)

To factorise this expression, identify the HCF of \(6x\)and 9, which is 3.

The HCF of \(6x+9\) is 3. Write 3 in front of the bracket:

\(3(?+?)\)

Find the missing terms in the bracket by dividing the original term by 3:

\(6x \div 3 = 2x\) and \(9 \div 3 = 3\)

This gives: \(3(2x + 3)\)

To check this answer is right, expand the bracket and check that the answer matches the original equation:

\(3(2x + 3) = 3 \times 2x + 3 \times 3 = 6x + 9\)

Question

Factorise \(12ab - 8ac + 4a^2b\).

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Factorising quadratics
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Expanding three brackets - Higher

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