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Published byColeman Broxton Modified over 2 years ago

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Factoring – Trinomials (a 1), ac Method The idea is to write the middle term of the trinomial as two terms in such a way that the grouping method can be used to finish the factoring. Another method for factoring these trinomials is called the ac method (also called the grouping method). The previous slideshow demonstrated how to use the Guess and Check method to factor trinomials of the form

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1.Determine the value of ac ac Method 2.Find factors of ac whose sum is b 3.Rewrite the trinomial, where the term bx is written as two terms using step 2 4.Factor using the grouping method

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Example 1 Factor: 1.Determine the value of ac 2.Find factors of ac whose sum is b In this case we would like to find two factors of -60 whose sum is +17. To get -60 the factors will have to be opposite is sign.

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Since b=17 is positive, let the negative factor be the smaller of the two numerical values. Sum of FactorsFactors of -60 It is of course faster if the above work can be completed in your head.

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3.Rewrite the trinomial, where the term bx is written as two terms using step 2

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4.Factor using the grouping method

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The trinomial is factored using

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Example 2 Factor: 1.Determine the value of ac 2.Find factors of ac whose sum is b In this case we would like to find two factors of 420 whose sum is -43.

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To multiply and get 420 which is positive, the factors will need to be the same sign. Sum of FactorsFactors of 420 To add to -43 means they will both be negative. Start with larger numbers since we know (-1)(-420) wont even be close.

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3.Rewrite the trinomial, where the term bx is written as two terms using step 2

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4.Factor using the grouping method

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The trinomial is factored using

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