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i suppose you mean two unknowns

let them be x and y.

x+y=8....................(1)

xy=-5.....................(2)

from (1), x=8-y

substitute this into (2),

(8-y)y=-5

8y-y^2=-5

by solving quadratic equation, there are two possible values:

y=4+sqrt(21) and y=4-sqrt(21)

therefore, the two numbers are (4+sqrt(21)) and (4-sqrt(21))

Q: What equals 8 when added but -5 when multiplied together?

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3, 5 and 7

4 multiplied by 4 is equal to 16 .5 multiplied by 4 is equal to 2 16 added to 2 equals 18

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(5/2 + √17/2) ≈ 4.562, and(5/2 - √17/2) ≈ 0.438

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4 multiplied by 4 is equal to 16 .5 multiplied by 4 is equal to 2 16 added to 2 equals 18

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