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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
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.