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	Graphing Inequalities in Two Variables
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	Simple Trinomials as Products of Binomials
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	Multiplying and Dividing Fractions 2
	Rational Numbers
	Difference of Two Squares
	Factoring Polynomials by Grouping
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	The Distance and Midpoint Formulas
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	Properties of Exponents
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	Relatively Prime Numbers
	Solving a Quadratic Inequality with Two Solutions
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	Factoring a Difference of Two Squares
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	Factoring Completely General Quadratic Trinomials
	Using Patterns to Multiply Two Binomials
	Adding and Subtracting Rational Expressions With Unlike Denominators
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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:

a²- b²= ( a + b )( a - b )

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

The answer is 320.