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12 May, 20:24

Simplify the following expression into the form a+bi where a and b are rational numbers

(3+7i) (-2-2i) - 4i (5-9i)

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  1. 12 May, 23:05
    0
    - 28 - 40i

    note that i² = (√-1) ² = - 1

    expand product of factors using FOIL

    = - 6 - 6i - 14i - 14i² - 20i + 36i²

    = - 6 - 6i - 14i + 14 - 20i - 36

    = - 28 - 40i
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