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: 64

Answer

$ -\frac{34}{53}+\frac{40}{53} i $

Work Step by Step

Given\begin{equation} \frac{4+6 i}{2-7 i}. \end{equation} Multiply both numerator and denominator by conjugate of the denominator and simplify. \begin{equation} \begin{aligned} \frac{4+6 i}{2-7 i}&=\frac{4+6 i}{2-7 i}\cdot \frac{(2+7 i)}{(2+7 i)}\\ & =\frac{4(2+7 i)+6i(2+7 i)}{4+49}\\ &=\frac{8+28i+12i-42}{53}\\ &= -\frac{34}{53}+\frac{40}{53} i \\ \end{aligned} \end{equation}.
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