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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
50/n = n-10 // - n-10
50/n-n+10 = 0
50*n^-1-1*n^1+10*n^0 = 0
(10*n^1-1*n^2+50*n^0)/(n^1) = 0 // * n^2
n^1*(10*n^1-1*n^2+50*n^0) = 0
n^1
10*n-n^2+50 = 0
10*n-n^2+50 = 0
DELTA = 10^2-(-1*4*50)
DELTA = 300
DELTA > 0
n = (300^(1/2)-10)/(-1*2) or n = (-300^(1/2)-10)/(-1*2)
n = (10*3^(1/2)-10)/(-2) or n = (-10*3^(1/2)-10)/(-2)
n in { (10*3^(1/2)-10)/(-2), (-10*3^(1/2)-10)/(-2)}
n in { (10*3^(1/2)-10)/(-2), (-10*3^(1/2)-10)/(-2) }
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