Answer
$$1-i\cdot1-i=-2i+1$$
Explanation
| $$ \begin{aligned}1-i\cdot1-i& \xlongequal{ }1-i-i \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-2i+1\end{aligned} $$ | |
| ① | Combine like terms: $$ 1 \color{blue}{-i} \color{blue}{-i} = \color{blue}{-2i} +1 $$ |
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