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D( n )
n^8 = 0
n^8 = 0
n^8 = 0
1*n^8 = 0 // : 1
n^8 = 0
n = 0
n in (-oo:0) U (0:+oo)
4/(n^8) = 10 // - 10
4/(n^8)-10 = 0
4*n^-8 = 10 // : 4
n^-8 = 5/2
-8 < 0
1/(n^8) = 5/2 // * n^8
1 = 5/2*n^8 // : 5/2
2/5 = n^8
n^8 = 2/5 // ^ 1/8
abs(n) = (2/5)^(1/8)
n = (2/5)^(1/8) or n = -(2/5)^(1/8)
n in { (2/5)^(1/8), -(2/5)^(1/8) }
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