How to Factorise Algebraic Expressions: A Practical Guide

How to Factorise Algebraic Expressions: A Practical Guide

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Using the Cross Method for Quadratics

Use this technique when factorising quadratic expressions where the coefficient of x squared is one. Split the middle term by finding two numbers that multiply to the constant and add to the linear coefficient. Write the factors in brackets based on the cross-multiplication results to complete the expression.

Recognising Difference of Two Squares

This method applies when you have two perfect squares separated by a subtraction sign. The formula is a squared minus b squared equals a plus b times a minus b. Ensure both terms are perfect squares before applying this specific algebraic pattern.

Identifying Common Factors

Start by looking for the highest common factor shared by all terms in the expression. Divide each term by this common factor and write the result inside the brackets. This simplifies the expression significantly and is the first step in most factorisation problems.

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Frequently Asked Questions


Identify and extract the highest common factor (HCF) from all terms in the expression before attempting other methods.
Apply the formula a^2 - b^2 = (a + b)(a - b) when the expression has two perfect squares separated by a minus sign.
Split the expression into two pairs, factor out the common term from each pair, and then take out the common bracket.
Common errors include forgetting to write a 1 in the bracket after division or failing to check if the expression can be factored further.
Multiply the factors back together to expand the brackets and ensure the result matches the original algebraic expression.
Yes, factorisation is a core topic in the Secondary 1 mathematics syllabus covering common factors and quadratic forms.