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McGraw Hill Integrated II, 2012

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McGraw Hill Integrated II, 2012 View details

Practice Test

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Exercise 25 Page 86

The formula to factor the difference of two squares is a^2-b^2=(a+b)(a-b).

(x+5)(x-5)

Look closely at the expression x^2-25. It can be expressed as the difference of two perfect squares.

x^2-25

Write as a power

x^2-5^2

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. x^2- 5^2 ⇔ ( x+ 5)( x- 5)

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