Intermediate Algebra: Connecting Concepts through Application

Published by Brooks Cole
ISBN 10: 0-53449-636-9
ISBN 13: 978-0-53449-636-4

Chapter 8 - Radical Functions - 8.5 Complex Numbers - 8.5 Exercises - Page 663: 67

Answer

$\frac{1082}{221}+\frac{197}{221}i$

Work Step by Step

Rewrite the given expression by multiplying both numerator and xenominator by $-1$, and solve the latter. \begin{equation} \frac{-12-73 i}{-5-14 i} = \frac{12+73 i}{5+14 i}. \end{equation} Multiply both numerator and denominator by the conjugate of the denominator and simplify. \begin{equation} \begin{aligned} \frac{12+73 i}{5+14 i}&=\frac{12+73 i}{5+14 i}\cdot \frac{(5-14 i)}{(5-14 i)}\\ & =\frac{12(5-14 i)+73i(5-14 i)}{25+196}\\ &=\frac{60-168i+365i+1022}{221}\\ &= \frac{1082}{221}+\frac{197}{221} i. \end{aligned} \end{equation}
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