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Thread: SAT subject math 2 - Complex numbers

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  1. 12-27-2013, 05:39 AM #1
    lily
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    SAT subject math 2 - Complex numbers

    SAT subject math 2 - Complex numbers

    Which of the following is the result of the product ?

    (A)
    (B)
    (C)
    (D)
    (E)

    Thanks!
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  2. 12-27-2013, 05:40 AM #2
    miranda
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    For the imaginary unit holds that

    So,

    Therefore the correct answer is (C).
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  3. 12-27-2013, 05:41 AM #3
    lily
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    Thank you miranda!
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