Seudónimo
Seudónimo
29-01-2016
Mathematics
contestada
what two number multiply to 2 but add up to -2
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konrad509
konrad509
29-01-2016
[tex]xy=2\\ x+y=-2\\\\ xy=2\\ x=-y-2\\\\ (-y-2)y=2\\ -y^2-2y=2\\ y^2+2y=-2\\ y^2+2y+1=-1\\ (y+1)^2=-1 \Rightarrow y\in \emptyset [/tex]
There are no such numbers in real numbers.
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