Question

X-Y=9 e embaixo x.Y=-14 resolvam

Answer 1

um sistema.
x-y=9
x.y= -14

x=9+y
(9+y).y = -14
y² +9y +14 =0

-b +- √b²-4ac /2a
-9 +- √81-56 /2

x' = -9 + 5 /2 = -2
x" = -9 -5 /2 = -7

x { -2, -7}