Question

Consider:2(-3i+4)-i(4-i2)
Simplify the expression and then determine a and b that produce an equivalent expression of the form a+bi.
a. A=8,b=11
b. A=8,b=-11
c. A=7,b=-10
d. A=7,b=9

Answer 1

first step:
since \(i^2=-1\), then we can rewrite such expression as below:
\[\Large \begin{gathered}
2\left( { - 3i + 4} \right) - i\left( {4 - {i^2}} \right) = \hfill \\
\hfill \\
= - 6i + 8 - i\left( {4 + 1} \right) = ...? \hfill \\
\end{gathered} \]
please continue

Answer 2

what?