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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
9/n = 8*n+23 // - 8*n+23
9/n-(8*n)-23 = 0
9/n-8*n-23 = 0
9*n^-1-8*n^1-23*n^0 = 0
(9*n^0-8*n^2-23*n^1)/(n^1) = 0 // * n^2
n^1*(9*n^0-8*n^2-23*n^1) = 0
n^1
9-8*n^2-23*n = 0
9-8*n^2-23*n = 0
DELTA = (-23)^2-(-8*4*9)
DELTA = 817
DELTA > 0
n = (817^(1/2)+23)/(-8*2) or n = (23-817^(1/2))/(-8*2)
n = (817^(1/2)+23)/(-16) or n = (23-817^(1/2))/(-16)
n in { (817^(1/2)+23)/(-16), (23-817^(1/2))/(-16)}
n in { (817^(1/2)+23)/(-16), (23-817^(1/2))/(-16) }
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