Year 10 Interactive Maths - Second Edition

The Difference of Two Squares

This formula is used to factorise some algebraic expressions.

Example 5

Solution:

Taking out a Common Factor

To factorise an algebraic expression, always look for a common factor. If there is a common factor, then take it out and use the difference of two squares formula.

Example 6

Solution:

Example 7

Solution:

Note the use of brackets.

Key Terms

difference of two squares (DOTS)