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Multiplying and Dividing Complex Numbers

10. Quadratic Equations / Multiplying and Dividing Complex Numbers / 문제 2

문제 2

Find the product $(- 1 + 3 i) (4 + 5 i)$ and give the answer in $a + b i$ form.

A

$11 plus 7 i$

B

$- 19 + 7 i$

C

$- 19 - 7 i$

D

$- 4 + 7 i$