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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
4/n+1/8 = (7/2)*n // - (7/2)*n
4/n-((7/2)*n)+1/8 = 0
(-7/2)*n+4/n+1/8 = 0
4*n^-1-7/2*n^1+1/8*n^0 = 0
(1/8*n^1-7/2*n^2+4*n^0)/(n^1) = 0 // * n^2
n^1*(1/8*n^1-7/2*n^2+4*n^0) = 0
n^1
(-7/2)*n^2+(1/8)*n+4 = 0
(-7/2)*n^2+(1/8)*n+4 = 0
DELTA = (1/8)^2-(4*4*(-7/2))
DELTA = 3585/64
DELTA > 0
n = ((3585/64)^(1/2)-(1/8))/(2*(-7/2)) or n = (-(1/8)-(3585/64)^(1/2))/(2*(-7/2))
n = ((3585/64)^(1/2)-1/8)/(-7) or n = ((3585/64)^(1/2)+1/8)/7
n in { ((3585/64)^(1/2)-1/8)/(-7), ((3585/64)^(1/2)+1/8)/7}
n in { ((3585/64)^(1/2)-1/8)/(-7), ((3585/64)^(1/2)+1/8)/7 }
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