Intermediate Algebra (12th Edition)

Published by Pearson
ISBN 10: 0321969359
ISBN 13: 978-0-32196-935-4

Appendix - Synthetic Division - Exercises - Page 646: 9

Answer

$p-4+\dfrac{9}{p+1}$

Work Step by Step

Setup: (the variable is $p$ instead of $x$) Dividing with $x-k$, place k as the top left entry. List coefficients of the numerator (0 for missing powers) in the first row. Copy the leading coefficient to the bottom row, same column. $\begin{array}{rrr} {-1)} &{1}&{-3}&{5}\\ { } &{ }&{ } &{ }\\ \hline &{1 }&{ } &{ }\end{array}$ Fill the next entries, column by column: Middle row: k$\times$(previous bottom row entry) Bottom row: add the two entries above. Repeat. $\begin{array}{rrr} {-1)} &{1}&{-3}&{5}\\ { } &{ }&{-1 } &{ 4 }\\ \hline &{1 }&{ -4} &{ 9}\end{array}$ Interpret result: Q(x) is the quotient, R(x) the remainder. $\displaystyle \frac{P(x)}{D(x)}=Q(x)+\frac{R(x)}{D(x)}$ $Q(p)=p-4,\quad R(p)=9$ $\displaystyle \frac{p^{2}-3p+5}{p+1}=p-4+\frac{9}{p+1}$
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