3 years ago

Simplify: (-1+4i)(-12-9i)

2 answers:

7 0

$(-1+4i)(-12-9i)=(-1)(-12)+(-1)(-9i)+(4i)(-12)+(4i)(-9i)$

$= 12+9i-48i+36=48-39i$

5 0

-1 (-12 - 9i) + 4i (-12 - 9i)

= 12 + 9i + -48i + 9i^2

= 9i^2 + 39i + 12

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