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