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What numbers add up to -5 and multiply to get -90

User Dabljues
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2 Answers

6 votes
You don't say how many numbers you want to do that with.

If you want just two numbers, then they're +7.3107 and -12.3107 .
(Those are rounded, not exact.)

I took a quick look among the factors of 90, looking for sets of 3 numbers
that would do it, and I couldn't find any.
User Bouncner
by
8.1k points
2 votes
let
x-------> the first number
y-------> the second number

we know that


x+y=-5 \\ x=-5-y equation 1


x*y=-90 equation 2

substitute the equation 1 in equation 2


[-5-y]*y=-90 \\ -5y- y^(2) =-90 \\ y^(2) +5y-90=0

using a graphical tool to resolve the second order equation
see the attached figure
the numbers are
-12.311
7.311

What numbers add up to -5 and multiply to get -90-example-1
User Jayms
by
7.9k points

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