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D( x )
8*x = 0
8*x = 0
8*x = 0
8*x = 0 // : 8
x = 0
x in (-oo:0) U (0:+oo)
(72*x^9-(32*x^5))/(8*x) = 0
(72*x^9-32*x^5)/(8*x) = 0
72*x^9-32*x^5 = 0
8*x^5*(9*x^4-4) = 0
9*x^4 = 4 // : 9
x^4 = 4/9
x^4 = 4/9 // ^ 1/4
abs(x) = (4/9)^(1/4)
x = (4/9)^(1/4) or x = -(4/9)^(1/4)
8*x^5*(x-(4/9)^(1/4))*(x+(4/9)^(1/4)) = 0
(8*x^5*(x-(4/9)^(1/4))*(x+(4/9)^(1/4)))/(8*x) = 0
( 8*x^5 )
8*x^5 = 0 // : 8
x^5 = 0
x = 0
( x+(4/9)^(1/4) )
x+(4/9)^(1/4) = 0 // - (4/9)^(1/4)
x = -(4/9)^(1/4)
( x-(4/9)^(1/4) )
x-(4/9)^(1/4) = 0 // + (4/9)^(1/4)
x = (4/9)^(1/4)
x in { 0}
x in { -(4/9)^(1/4), (4/9)^(1/4) }
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