Question
Answer
$$-2i^2-7i+15=-7i+17$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-2i^2-7i+15& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}2-7i+15 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-7i+17\end{aligned} $$ | |
| ① | $$ -2i^2 = -2 \cdot (-1) = 2 $$ |
| ② | Combine like terms: $$ -7i+ \color{blue}{2} + \color{blue}{15} = -7i+ \color{blue}{17} $$ |
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