Question

If u = 8 + 4i and v = 3i + 6, then what is u – v ?
a)2+2i
b)5-2i
C)1+i
D)2+i
E)2-i

Answer 1

@leoh1998

Answer 2

by definition, we have:
\[\Large \begin{gathered}
u - v = \left( {8 + 4i} \right) - \left( {6 + 3i} \right) = 8 + 4i - 6 - 3i = \hfill \\
\hfill \\
= \left( {8 - 6} \right) + i\left( {4 - 3} \right) = ...? \hfill \\
\end{gathered} \]