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Svetradugi [14.3K]
3 years ago
15

Perform the indicated operation and write the answer in the form a + bi. (1 + i)(-3 - 4i)

Mathematics
1 answer:
PtichkaEL [24]3 years ago
8 0

Answer:

1-7i

Step-by-step explanation:

\left(1+i\right)\left(-3-4i\right)

=\left(1\cdot \left(-3\right)-1\cdot \left(-4\right)\right)+\left(1\cdot \left(-4\right)+1\cdot \left(-3\right)\right)i

1\cdot \left(-3\right)-1\cdot \left(-4\right)

=-3+4

=1

1\cdot \left(-4\right)+1\cdot \left(-3\right)

=-4-3

=-7

=1-7i

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