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D( x )
x < 0
x < 0
x in <0:+oo)
16*x^(3/2)-(64*x^(5/2)) = 0
16*x^(3/2)-64*x^(5/2) = 0
16*x^(3/2)-64*x^(5/2) = 0
16*x^(3/2)*(1-4*x) = 0
1-4*x = 0 // - 1
-4*x = -1 // : -4
x = -1/(-4)
x = 1/4
16*x^(3/2) = 0
16*x^(3/2) = 0 // : 16
x^(3/2) = 0
x = 0
x in { 1/4, 0 }
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