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Published byKathryn George Modified over 9 years ago

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Adding and Subtracting Polynomials Objective: Students will add and subtract polynomials. S. Calahan March 2008

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Adding To add polynomials group like terms horizontally or write them in column form, aligning like terms.

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(3x 2 – 4x + 8) + (2x – 7x 2 – 5) Method 1: horizontal Group like terms. (3x 2 – 7x 2 ) + (-4x + 2x) + (8 – 5) add like terms. -4x 2 – 2x + 3

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Method 2: vertical 3x 2 – 4x + 8 + -7x 2 + 2x -5 - 4x 2 – 2x + 3 Notice that terms are in descending order with like terms aligned.

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Subtracting Polynomials When you subtract polynomials add its opposite or additive inverse. example: -5x + 3n subtract - (-5x + 3n) Distribute the negative 5x – 3n

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(3n 2 +13n 3 +5n) – (7n+4n 3 ) Method 1: horizontal method (3n 2 +13n 3 +5n) – (7n + 4n 3 ) Distribute the negative (3n 2 +13n 3 +5n) + (-7n – 4n 3 ) Group like terms. (13n 3 – 4n 3 ) + 3n 2 + (5n – 7n)

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add like terms 9n 3 + 3n 2 – 2n

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Method 2: Vertical (3n 2 +13n 3 +5n) – (7n+4n 3 ) Write in descending order 13n 3 + 3n 2 + 5n - (4n 3 + 7n)

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13n 3 + 3n 2 + 5n - (4n 3 + 7n) Add the opposite 13n 3 + 3n 2 + 5n - 4n 3 - 7n 9n 3 + 3n 2 – 2n

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