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

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asked Aug 24, 2017 89.3k views

1 Answer

Kamil Szot · Answer 1 · 2017-08-30T17:58:24+0000

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)

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

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