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D( x )
x < 0
(x^1)/2-4 = 0
x < 0
(x^1)/2-4 = 0
(x^1)/2-4 = 0
x/2-4 = 0
1/2*x-4 = 0 // + 4
1/2*x = 4 // : 1/2
x = 4/1/2
x = 8
x in <0:8) U (8:+oo)
(x^(1/4)-2)/((x^1)/2-4) = 0
(x^(1/4)-2)/(x/2-4) = 0
(x^(1/4)-2)/(1/2*x-4) = 0
1*x^(1/4) = 2 // : 1
x^(1/4) = 2
x^(1/4) = 2 // ^ 4
x = 16
x = 16
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