Question
Answer
$$65i\cdot(6-5i)=390i+325$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}65i\cdot(6-5i)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}390i-325i^2 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}390i+325\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{65i} $ by $ \left( 6-5i\right) $ $$ \color{blue}{65i} \cdot \left( 6-5i\right) = 390i-325i^2 $$ |
| ② | $$ -325i^2 = -325 \cdot (-1) = 325 $$ |
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