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16-11-2016
Mathematics

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What two numbers multiply to get -12 but add to get -1?

Respuesta :

16-11-2016

The answer is -4 and 3

Answer Link

16-11-2016

xy = - 12
x + y = - 1

x = - 12/y
- 12/y + y = - 1
- 12 + y^2 = - y
y^2 + y - 12 = 0
( y - 3 ) ( y + 4 ) = 0
y = 3 , y = - 4

3x = - 12
x = - 4

y = 3

Answer Link

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