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10 October, 10:05

What can multiply to give you 80 but add up to give you 11

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  1. 10 October, 13:57
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    There are no real numbers that can do that job.

    There's a pair of complex numbers that can do it.

    They are

    5.5 + i4.97

    and

    5.5 - i4.97.

    ' i ' = the imaginary unit = √ (-1)
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