Question
Answer
$$42i^2-16i-8=-16i-50$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}42i^2-16i-8& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-42-16i-8 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-16i-50\end{aligned} $$ | |
| ① | $$ 42i^2 = 42 \cdot (-1) = -42 $$ |
| ② | Combine like terms: $$ -16i \color{blue}{-42} \color{blue}{-8} = -16i \color{blue}{-50} $$ |
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