Question
Multiply $ : − x + y − z$ and $− 2x$
✓
Answer
$ (− x + y − z) \times −2x$
$= − x \times − 2x + y \times − 2x − z \times − 2x$
$= 2x^2 − 2xy + 2xz$
$= − x \times − 2x + y \times − 2x − z \times − 2x$
$= 2x^2 − 2xy + 2xz$
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