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D( x )
x < 0
x < 0
x in <0:+oo)
x-x^(1/2) = -64 // + 64
x-x^(1/2)+64 = 0
t_1 = x^(1/2)
1*t_1^2-1*t_1^1+64 = 0
t_1^2-t_1+64 = 0
DELTA = (-1)^2-(1*4*64)
DELTA = -255
DELTA < 0
x belongs to the empty set
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