Question
Answer
$$3i\cdot(6-5i)=18i+15$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}3i\cdot(6-5i)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}18i-15i^2 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}18i+15\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{3i} $ by $ \left( 6-5i\right) $ $$ \color{blue}{3i} \cdot \left( 6-5i\right) = 18i-15i^2 $$ |
| ② | $$ -15i^2 = -15 \cdot (-1) = 15 $$ |
This page was created using
Complex Expression calculator