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D( x )
x < 0
x < 0
x in <0:+oo)
3*x = 6*x^(1/2) // - 6*x^(1/2)
3*x-(6*x^(1/2)) = 0
3*x-6*x^(1/2) = 0
t_1 = x^(1/2)
3*t_1^2-6*t_1^1 = 0
3*t_1^2-6*t_1 = 0
DELTA = (-6)^2-(0*3*4)
DELTA = 36
DELTA > 0
t_1 = (36^(1/2)+6)/(2*3) or t_1 = (6-36^(1/2))/(2*3)
t_1 = 2 or t_1 = 0
t_1 = 0
x^(1/2)+0 = 0
x^(1/2) = 0
1*x^(1/2) = 0 // : 1
x^(1/2) = 0
x = 0
t_1 = 2
x^(1/2)-2 = 0
1*x^(1/2) = 2 // : 1
x^(1/2) = 2
x^(1/2) = 2 // ^ 2
x = 4
x in { 0, 4 }
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