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25 January, 23:02

How do i solve this complex number (-3i) (-5i) (6+i)

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  1. 25 January, 23:26
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    First combine the 3i and 5i. They are multiplied.

    3*5 * i*i

    i*i = - 1

    3*5 = 15

    This much is - 15

    Now use the distributive law.

    -15 * (6 + i)

    -90 - 15i
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