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2 February, 00:51

Multiply and simplify the following complex numbers: (1 + 2i) x (1 - 4i)

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  1. 2 February, 01:05
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    9-2i

    Step-by-step explanation:

    (1 + 2i) * (1 - 4i)

    (1*1) - (1*4i) + (2i*1) - (2i) * (4i)

    (1) - (4i) + (2i) - (8i^2)

    i^2 = - 1

    1-4i+2i+8

    1-2i+8

    9-2i
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