Answer
$$1-i\cdot1-1=-i$$
Explanation
| $$ \begin{aligned}1-i\cdot1-1& \xlongequal{ } \cancel{1}-i -\cancel{1} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-i\end{aligned} $$ | |
| ① | Combine like terms: $$ \, \color{blue}{ \cancel{1}} \,-i \, \color{blue}{ -\cancel{1}} \, = -i $$ |
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