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D( x )
x < 0
x < 0
x in <0:+oo)
0 = x^(9/2)-(8*x^2) // - x^(9/2)-(8*x^2)
8*x^2-x^(9/2)+0 = 0
8*x^2-x^(9/2) = 0
8*x^2-x^(9/2) = 0
x^2*(8-x^(5/2)) = 0
-1*x^(5/2) = -8 // : -1
x^(5/2) = 8
x^(5/2) = 8 // ^ 2
x^5 = 64 // ^ 1/5
x = 2*2^(1/5)
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 2*2^(1/5), 0 }
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