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McGraw Hill Integrated II, 2012
MH
McGraw Hill Integrated II, 2012 View details
Practice Test
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Exercise 26 Page 86

Look closely at the expression 4x^2-81. It can be expressed as the difference of two perfect squares.

4x^2-81
WritePow

Write as a power

2^2x^2-9^2
ProdPowII

a^m b^m = (a b)^m

(2x)^2-9^2
Recall the formula to factor a difference of squares. a^2- b^2 ⇔ ( a+ b)( a- b) We can apply this formula to our expression. ( 2x)^2- 9^2 ⇔ ( 2x+ 9)( 2x- 9)

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