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9 July, 04:14

If the complex number x = 3 + bi and |x|2 = 13, which is a possible value of b?

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  1. 9 July, 04:40
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    |x|^2 = 13

    |x|^2 = 3^2 + b^2 = 9 + b^2

    b^2 + 9 = 13

    b^2 = 13 - 9

    b^2 = 4

    b = 2 or - 2
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