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Year 9 Interactive Maths - Second Edition


Factorisation of a Difference of Two Squares


Example 9

Solution:


Taking out a Common Factor

To factorise an expression, take out any common factor; and then use the formula:


Example 10

Solution:


A Calculation Short Cut

Some arithmetic expressions can be evaluated easily using the factorisation of the difference of two squares.

Example 11

Solution:


Key Terms

difference of two squares, DOTS


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