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D( x )
4*x^8 < 0
4*x^8 < 0
4*x^8 < 0
4*x^8 < 0
4*x^8 < 0 // : 4
x^8 < 0/4
x^8 < 0
x belongs to the empty set
x in (-oo:+oo)
(4*x^8)^(3/2) = 0
8*x^12 = 0 // : 8
x^12 = 0
x = 0
x = 0
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