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D( x )
2*x < 0
9*x < 0
2*x < 0
2*x < 0
2*x+0 < 0 // - 0
2*x < 0 // : 2
x < 0/2
x < 0
9*x < 0
9*x < 0
9*x+0 < 0 // - 0
9*x < 0 // : 9
x < 0/9
x < 0
x in <0:+oo)
(2*x)^(1/2)-(9*x)^(1/4)+6 = 0
2^(1/2)*x^(1/2)-x^(1/4)+6 = 0
t_1 = x^(1/4)
2^(1/2)*t_1^2-1*t_1^1+6 = 0
2^(1/2)*t_1^2-t_1+6 = 0
DELTA = (-1)^2-(4*6*2^(1/2))
DELTA = 1-24*2^(1/2)
DELTA = -32.94112544
DELTA < 0
x belongs to the empty set
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