Question
Answer
$$9i\cdot72-5i\cdot8+11i\cdot57+12i\cdot34=1643i$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}9i\cdot72-5i\cdot8+11i\cdot57+12i\cdot34& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} \htmlClass{explanationCircle explanationCircle3}{\textcircled {3}} \htmlClass{explanationCircle explanationCircle4}{\textcircled {4}} } }}}648i-40i+627i+408i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle5}{\textcircled {5}} } }}}1643i\end{aligned} $$ | |
| ① | $$ 9 i \cdot 72 = 648 i $$ |
| ② | $$ 5 i \cdot 8 = 40 i $$ |
| ③ | $$ 11 i \cdot 57 = 627 i $$ |
| ④ | $$ 12 i \cdot 34 = 408 i $$ |
| ⑤ | Combine like terms: $$ \color{blue}{648i} \color{red}{-40i} + \color{green}{627i} + \color{green}{408i} = \color{green}{1643i} $$ |
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