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14 August, 16:12

Which expression represents the number 5i4+2i3+8i2+-4 rewritten in a+bi form?

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  1. 14 August, 16:39
    0
    Remember

    i²=-1 so

    i³=-i

    i⁴=1

    so

    5i⁴+2i³+8i²-4

    5 (1) + 2 (-i) + 8 (-1) - 4

    5-2i-8-4

    -7-2i is the form
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