Divide using synthetic division. (x2−5x−5x3+x4)÷(5+x)

Ch. 3 - Polynomial and Rational Functions

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Blitzer 8th Edition

Ch. 3 - Polynomial and Rational Functions

문제 25

4장, 문제 25

Divide using synthetic division. (x²−5x−5x³+x⁴)÷(5+x)

검증된 단계별 안내

First, rewrite the dividend polynomial in standard form, arranging the terms in descending powers of x: \(x^{4} - 5x^{3} + x^{2} - 5x\).

Identify the divisor, which is \(5 + x\). Rewrite it in the form \(x - r\) by factoring out a negative sign: \(x + 5 = x - (-5)\), so \(r = -5\).

Set up synthetic division by writing the coefficients of the dividend polynomial in order, including zeros for any missing powers: coefficients are \([1, -5, 1, -5, 0]\) corresponding to \(x^{4}, x^{3}, x^{2}, x^{1}, x^{0}\).

Perform synthetic division using \(r = -5\): bring down the first coefficient, multiply by \(r\), add to the next coefficient, and repeat this process across all coefficients.

Write the quotient polynomial using the results from synthetic division, noting that the degree of the quotient is one less than the dividend, and express the remainder if any.

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주요 개념

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Polynomial Division

Polynomial division is the process of dividing one polynomial by another, similar to numerical long division. It helps simplify expressions and find quotients and remainders. Understanding how to organize terms by descending powers is essential before performing the division.

Synthetic Division

Synthetic division is a shortcut method for dividing a polynomial by a linear binomial of the form (x - c). It uses only the coefficients of the polynomial, making the process faster and less error-prone than long division. It requires the divisor to be in the form x - c, so adjustments may be needed.

Polynomial Standard Form and Rearrangement

Before dividing, polynomials must be written in standard form, with terms ordered from highest to lowest degree and all degrees represented, including zero coefficients if necessary. Rearranging the given polynomial and divisor into this form ensures synthetic division can be applied correctly.