Answer
$6$
Work Step by Step
By removing the parentheses subtracting each term of the subtrahend then combining like terms, we obtain:
\begin{align*}
(3 - 4i) -( - 3 - 4i)&=3-4i-(-3)-(-4i)\\
&=3-4i+3+4i\\
&=(3+3)+(-4i+4i)\\
&=6
\end{align*}
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Appendix A - Review - A.11 Complex Numbers - A.11 Assess Your Understanding - Page A94: 12
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