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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(8/5)*n = 4/n // - 4/n
(8/5)*n-(4/n) = 0
(8/5)*n-4*n^-1 = 0
8/5*n^1-4*n^-1 = 0
(8/5*n^2-4*n^0)/(n^1) = 0 // * n^2
n^1*(8/5*n^2-4*n^0) = 0
n^1
(8/5)*n^2-4 = 0
(8/5)*n^2-4 = 0
DELTA = 0^2-(-4*4*(8/5))
DELTA = 128/5
DELTA > 0
n = ((128/5)^(1/2)+0)/(2*(8/5)) or n = (0-(128/5)^(1/2))/(2*(8/5))
n = 5/16*(128/5)^(1/2) or n = 5/16*(128/5)^(1/2)
n in { 5/16*(128/5)^(1/2), 5/16*(128/5)^(1/2)}
n in { 5/16*(128/5)^(1/2), 5/16*(128/5)^(1/2) }
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