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D( n )
4*n-6 = 0
4*n-6 = 0
4*n-6 = 0
4*n-6 = 0 // + 6
4*n = 6 // : 4
n = 6/4
n = 3/2
n in (-oo:3/2) U (3/2:+oo)
n-(1/(4*n-6))-(1/4) = 0
n-(4*n-6)^-1-1/4 = 0
n-1/(4*n-6)-1/4 = 0
(-1*4)/(4*(4*n-6))+(4*n*(4*n-6))/(4*(4*n-6))+(-1*(4*n-6))/(4*(4*n-6)) = 0
4*n*(4*n-6)-1*(4*n-6)-1*4 = 0
16*n^2-24*n-4*n-4+6 = 0
16*n^2-28*n+2 = 0
16*n^2-28*n+2 = 0
2*(8*n^2-14*n+1) = 0
8*n^2-14*n+1 = 0
DELTA = (-14)^2-(1*4*8)
DELTA = 164
DELTA > 0
n = (164^(1/2)+14)/(2*8) or n = (14-164^(1/2))/(2*8)
n = (2*41^(1/2)+14)/16 or n = (14-2*41^(1/2))/16
2*(n-((14-2*41^(1/2))/16))*(n-((2*41^(1/2)+14)/16)) = 0
(2*(n-((14-2*41^(1/2))/16))*(n-((2*41^(1/2)+14)/16)))/(4*(4*n-6)) = 0
(2*(n-((14-2*41^(1/2))/16))*(n-((2*41^(1/2)+14)/16)))/(4*(4*n-6)) = 0 // * 4*(4*n-6)
2*(n-((14-2*41^(1/2))/16))*(n-((2*41^(1/2)+14)/16)) = 0
( 2 )
2 = 0
n belongs to the empty set
( n-((14-2*41^(1/2))/16) )
n-((14-2*41^(1/2))/16) = 0 // + (14-2*41^(1/2))/16
n = (14-2*41^(1/2))/16
( n-((2*41^(1/2)+14)/16) )
n-((2*41^(1/2)+14)/16) = 0 // + (2*41^(1/2)+14)/16
n = (2*41^(1/2)+14)/16
n in { (14-2*41^(1/2))/16, (2*41^(1/2)+14)/16 }
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