Question
Answer
$$4-4i^3=4i+4$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}4-4i^3& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}4+4i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}4i+4\end{aligned} $$ | |
| ① | $$ -4i^3 = -4 \cdot \color{blue}{i^2} \cdot i =
-4 \cdot ( \color{blue}{-1}) \cdot i =
4 \cdot \, i $$ |
| ② | Combine like terms: $$ 4i+4 = 4i+4 $$ |
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