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Published byHenry Perry Modified over 9 years ago
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Factoring Trinomials Using FOIL Reversed...also called guess and check
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FACTORING POLYNOMIALS GCF is first! Are there any squared terms left over? 2 Terms It is possibly the difference of two squares (DOTS) 3 Terms If a = 1, do guess and check. If a is a number other than 1, do guess/check or factor by grouping (product/sum). 4 Terms Factor by grouping. We’ll look into this one today.
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FACTOR: FACTORING is like playing JEOPARDY. You have the answer and must get the question.
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FACTOR:
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( )( ) (y )(y )
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FACTOR: (y )(y ) (y 5)(y 3)
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Wait until later to decide what signs go there.
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(y 5)(y 3) 15 could be 5 times 3 Or -5 times -3
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Try:
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and don’t make –8y.
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PLUS HAS TO ADD UP TO THE MIDDLE TERM.
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Try:
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There is a lot more to factoring. It takes lots of practice.
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THE END
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