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D( n )
3*(5*n+3) = 0
3*(5*n+3) = 0
3*(5*n+3) = 0
5*n+3 = 0 // - 3
5*n = -3 // : 5
n = -3/5
n in (-oo:-3/5) U (-3/5:+oo)
1/(3*(5*n+3))+(3*n)/3+n = 0
1/(3*(5*n+3))+n+n = 0
1/(3*(5*n+3))+(3*n*(5*n+3))/(3*(5*n+3))+(3*n*(5*n+3))/(3*(5*n+3)) = 0
3*n*(5*n+3)+3*n*(5*n+3)+1 = 0
15*n^2+15*n^2+9*n+9*n+1 = 0
30*n^2+18*n+1 = 0
30*n^2+18*n+1 = 0
30*n^2+18*n+1 = 0
DELTA = 18^2-(1*4*30)
DELTA = 204
DELTA > 0
n = (204^(1/2)-18)/(2*30) or n = (-204^(1/2)-18)/(2*30)
n = (2*51^(1/2)-18)/60 or n = (-2*51^(1/2)-18)/60
(n-((-2*51^(1/2)-18)/60))*(n-((2*51^(1/2)-18)/60)) = 0
((n-((-2*51^(1/2)-18)/60))*(n-((2*51^(1/2)-18)/60)))/(3*(5*n+3)) = 0
((n-((-2*51^(1/2)-18)/60))*(n-((2*51^(1/2)-18)/60)))/(3*(5*n+3)) = 0 // * 3*(5*n+3)
(n-((-2*51^(1/2)-18)/60))*(n-((2*51^(1/2)-18)/60)) = 0
( n-((-2*51^(1/2)-18)/60) )
n-((-2*51^(1/2)-18)/60) = 0 // + (-2*51^(1/2)-18)/60
n = (-2*51^(1/2)-18)/60
( n-((2*51^(1/2)-18)/60) )
n-((2*51^(1/2)-18)/60) = 0 // + (2*51^(1/2)-18)/60
n = (2*51^(1/2)-18)/60
n in { (-2*51^(1/2)-18)/60, (2*51^(1/2)-18)/60 }
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