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D( x )
x < 0
x = 0
x < 0
x = 0
x = 0
x in (0:+oo)
2-(6*x^(-1/2)) = 0
2-6*x^(-1/2) = 0
-6*x^(-1/2) = -2 // : -6
x^(-1/2) = 1/3
-1/2 < 0
1/(x^(1/2)) = 1/3 // * x^(1/2)
1 = 1/3*x^(1/2) // : 1/3
3 = x^(1/2)
x^(1/2) = 3 // ^ 2
x = 9
x = 9
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