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Allisa [31]
3 years ago
14

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

Mathematics
2 answers:
vlada-n [284]3 years ago
6 0
You don't say <em>how many</em> numbers you want to do that with.

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

I took a quick look among the factors of 90, looking for sets of <em>3 numbers</em>
that would do it, and I couldn't find any.
Molodets [167]3 years ago
3 0
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

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