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Divide Polynomials Objectives: 1.To divide polynomials using long division and synthetic division
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Warm-Up Use long division to divide 5 into 3462. - - -
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Warm-Up - - - Divisor Dividend Quotient Remainder
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Warm-Up Use long division to divide 5 into 3462. Dividend Divisor Quotient Remainder Divisor
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Remainders divides evenly If you are lucky enough to get a remainder of zero when dividing, then the divisor divides evenly into the dividend factor This means that the divisor is a factor of the dividend For example, when dividing 3 into 192, the remainder is 0. Therefore, 3 is a factor of 192.
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Vocabulary QuotientRemainder DividendDivisor Divides EvenlyFactor
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Objective 1a You will be able to divide polynomials using long division
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Dividing Polynomials long division Dividing polynomials works just like long division. In fact, it is called long division! Before you start dividing: Make sure the divisor and dividend are in standard form If your polynomial is missing a term, add it in with a coefficient of 0 as a place holder
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Dividing Polynomials long division Dividing polynomials works just like long division. In fact, it is called long division! Before you start dividing: If your polynomial is missing a term, add it in with a coefficient of 0 as a place holder
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Exercise 1 Divide x + 1 into x 2 + 3 x + 5 Line up the first term of the quotient with the term of the dividend with the same degree. How many times does x go into x 2 ? Multiply x by x + 1 -- Multiply 2 by x + 1 --
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Exercise 1 Divide x + 1 into x 2 + 3 x + 5 -- -- Divisor Dividend Quotient Remainder
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Exercise 1 Divide x + 1 into x 2 + 3 x + 5 Divisor Dividend Quotient Remainder Divisor
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Exercise 2 Divide 3 x 4 – 5 x 3 + 4 x – 6 by x 2 – 3 x + 5
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Exercise 3 In a polynomial division problem, if the degree of the dividend is m and the degree of the divisor is n, what is the degree of the quotient?
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Exercise 4 Divide using long division.
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Exercise 5 Use long division to divide x 4 – 10 x 2 + 2 x + 3 by x – 3
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You will be able to divide polynomials using synthetic division
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Synthetic Division When you divisor is of the form x k, where k is a constant, then you can perform the division quicker and easier using just the coefficients of the dividend. synthetic division This is called fake division. I mean, synthetic division.
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Synthetic Division Synthetic Division Synthetic Division (of a Cubic Polynomial) To divide ax 3 + bx 2 + cx + d by x – k, use the following pattern. kabcd a ka = Add terms = Multiply by k Coefficients of Quotient (in decreasing order) Remainder
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Synthetic Division Synthetic Division Synthetic Division (of a Cubic Polynomial) To divide ax 3 + bx 2 + cx + d by x – k, use the following pattern. kabcd a ka = Add terms = Multiply by k You are always adding columns using synthetic division, whereas you subtracted columns in long division.
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Synthetic Division Synthetic Division (of a Cubic Polynomial) To divide ax 3 + bx 2 + cx + d by x – k, use the following pattern. Synthetic Division You are always adding columns using synthetic division, whereas you subtracted columns in long division. k can be positive or negative. If you divide by x + 2, then k = -2 because x + 2 = x – (-2). Add a coefficient of zero for any missing terms!
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Exercise 6 Use synthetic division to divide x 4 – 10 x 2 + 2 x + 3 by x – 3
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Exercise 7 Divide 2 x 3 + 9 x 2 + 4 x + 5 by x + 3 using synthetic division
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Exercise 8 Divide using long division.
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Exercise 9 Given that x – 4 is a factor of x 3 – 6 x 2 + 5 x + 12, rewrite x 3 – 6 x 2 + 5 x + 12 as a product of two polynomials.
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Exercise 10 The volume of the solid is 3 x 3 + 8 x 2 – 45 x – 50. Find an expression for the missing dimension. x + 5 ? x + 1
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Exercise 11 Use long division to divide 6 x 4 – 11 x 3 + 14 x 2 – 3 x – 1 by 2 x – 1. Then figure out a way to perform the division synthetically.
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Divide Polynomials Objectives: 1.To divide polynomials using long division and synthetic division
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