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D( x )
x^2-(3*x)-4 = 0
x^2-(3*x)-4 = 0
x^2-(3*x)-4 = 0
x^2-3*x-4 = 0
x^2-3*x-4 = 0
DELTA = (-3)^2-(-4*1*4)
DELTA = 25
DELTA > 0
x = (25^(1/2)+3)/(1*2) or x = (3-25^(1/2))/(1*2)
x = 4 or x = -1
x in (-oo:-1) U (-1:4) U (4:+oo)
(3*x-12)/(x^2-(3*x)-4) = 0
(3*x-12)/(x^2-3*x-4) = 0
x^2-3*x-4 = 0
x^2-3*x-4 = 0
DELTA = (-3)^2-(-4*1*4)
DELTA = 25
DELTA > 0
x = (25^(1/2)+3)/(1*2) or x = (3-25^(1/2))/(1*2)
x = 4 or x = -1
(x+1)*(x-4) = 0
(3*x-12)/((x+1)*(x-4)) = 0
3*x-12 = 0 // + 12
3*x = 12 // : 3
x = 12/3
x = 4
x in { 4}
x belongs to the empty set
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