Respuesta :

-3 + (-4)= -7
-3 times -4=12

negative plus a negative is still a negative. negative times a negative is a positive.
ghanami
hello : let x , y this numbers 
x+y = -7....(1)
xy = 12 ... (2)
by (1) : 
y = - 7 - x
subsct in (2) : 
x(-7 - x) = 12
-7x - x² = 12
x² +7x +12 = 0 
(x+4)(x +3) = 0
x+4 = 0 or x+3 = 0
so : x = -4 or x = -3

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