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5 February, 08:52

How to simply 5/3+i

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  1. 5 February, 09:44
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    I am assuming you mean 5 / (3 + i)

    Multiply top and bottom of the fraction by the complement of 3+i (which is 3-i)

    = 5 (3 - i) / (3 + i) (3 - i)

    = 15 - 5i / (9 - 3i + 3i - i^2) [Note - i^2 = + 1)

    = (15 - 5i) / (9 + 1)

    = (15 - 5i) 10

    = 1.5 - 0.5i answer
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