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Year 9 Interactive Maths - Second Edition


Perfect Squares


is a perfect square.


Geometrical Illustration

Consider a square of side (a + b) units as shown in the following diagram.

From (1) and (2), we get:


is a perfect square.


Example 11

Solution:

    Alternatively, we use the formula:



    as shown below.

    Alternatively, we use the formula:

    as shown below.


Example 12

Solution:


Application of Perfect Squares

Example 13

Expand:

Solution:


Key Terms

perfect square


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