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Unformatted text preview: + 6) Example 2 Factor x 2 – 7 x – 18. –18 can be factored in the following ways: (1)(–18), (–1)(18), (2)(–9), (–2)(9), (3)(–6), (–3)(6) The only combination whose sum is also –7 is (2)(–9), so x 2 – 7 x + 18 = ( x + 2)( x – 9) Example 3 Factor x 2 – 6 x + 9. 9 can be factored as (1)(9), (–1)(–9), (3)(3), (–3)(–3) The only combination whose sum is –6 is (–3)(–3), so x 2 – 6 x + 9 = ( x – 3)( x – 3) = ( x – 3) 2...
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 Fall '07
 staff
 Polynomials, Integers

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