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Difference of Two Squares

The difference of two squares trick is used with subtracting
two numbers that are perfect squares. The trick is to find the
product of the sum and difference of the numbers that are being
squared. Students in high school will recognize this trick in its
algebraic form:

a^{ 2 }- b^{ 2 }= ( a + b )( a - b )

Using the trick, add 24 + 16 = 40 and subtract 24 - 16 = 8.
Then multiply 40 Ã— 8 = 320.