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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
190*(n-2) = 160/n // - 160/n
190*(n-2)-(160/n) = 0
190*(n-2)-160*n^-1 = 0
190*(n-2)-160/n = 0
(190*n*(n-2))/n-160/n = 0
190*n*(n-2)-160 = 0
190*n^2-380*n-160 = 0
190*n^2-380*n-160 = 0
10*(19*n^2-38*n-16) = 0
19*n^2-38*n-16 = 0
DELTA = (-38)^2-(-16*4*19)
DELTA = 2660
DELTA > 0
n = (2660^(1/2)+38)/(2*19) or n = (38-2660^(1/2))/(2*19)
n = (2*665^(1/2)+38)/38 or n = (38-2*665^(1/2))/38
10*(n-((38-2*665^(1/2))/38))*(n-((2*665^(1/2)+38)/38)) = 0
(10*(n-((38-2*665^(1/2))/38))*(n-((2*665^(1/2)+38)/38)))/n = 0
(10*(n-((38-2*665^(1/2))/38))*(n-((2*665^(1/2)+38)/38)))/n = 0 // * n
10*(n-((38-2*665^(1/2))/38))*(n-((2*665^(1/2)+38)/38)) = 0
( 10 )
10 = 0
n belongs to the empty set
( n-((2*665^(1/2)+38)/38) )
n-((2*665^(1/2)+38)/38) = 0 // + (2*665^(1/2)+38)/38
n = (2*665^(1/2)+38)/38
( n-((38-2*665^(1/2))/38) )
n-((38-2*665^(1/2))/38) = 0 // + (38-2*665^(1/2))/38
n = (38-2*665^(1/2))/38
n in { (2*665^(1/2)+38)/38, (38-2*665^(1/2))/38 }
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