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x^2 - 7x + 12 = 0
(x-3) (x-4) = 0
X1 = 3/2 = 1,5 X2 = 4/2 = 2
a. x1 - 5 = 1,5 - 5 = -3,5
x2 - 5 = 2 - 5 = -3
b. 2.x1 = 2 (1,5) = 3
3.x2 = 3 (2) = 6
c. x1 + 3 = 1,5 + 3 = 4,5
x2 - 5 = 2 - 5 = -3
d. x1/x2 = 1,5/2 = 0,75
x2/x1 = 2/1,5 = 1,3