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16 January, 20:36

Simplify the following expression (10-4i) (4-5i) (-15+20 I)

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  1. 16 January, 20:45
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    Step-by-step explanation:

    (10-4i) (4-5i) (-15+20i)

    (10-4i) (4-5i) = 10 * (4-5i) - 4i * (4-5i)

    = 10*4 - 10*5i - 4i*4 + 4i*5i

    = 40 - 50i - 16i + 20i² = 40 - 66i + 20*-1 {i² = -1}

    = 40 - 66i - 20

    = 20 - 66i

    (20 - 66i) (-15 + 20i) = 20 * (-15 + 20i) - 66i * (-15 + 20i)

    = - 300 - 400i + 990i - 1320i²

    = - 300 - 400i + 990i - 1320 * (-1)

    = - 300 - 400i + 990i + 1320

    = 1020 + 590i
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