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Bilangan 1 = x
Bilangan 2 = y
Maka,
xy = 12
x -y = 4 --------> x = 4 +y
xy = 12
(4 +y)y = 12
4y +y² = 12
y² +4y -12 = 0
(y +6) (y -2) = 0
y +6 = 0
y = -6
y -2 = 0
y = 2
xy = 12
x . 2 = 12
x = 12/2
x = 6
Maka,
x +y
= 6 +2
= 8
Itu jawabannya.