Question
Answer
$$(2+9i)\cdot9=81i+18$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}(2+9i)\cdot9& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}18+81i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}81i+18\end{aligned} $$ | |
| ① | $$ \left( \color{blue}{2+9i}\right) \cdot 9 = 18+81i $$ |
| ② | Combine like terms: $$ 81i+18 = 81i+18 $$ |
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