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n in (-oo:+oo)
((5*n)/10)*n^2+5*n^2+25*n = 0
1/2*n^3+5*n^2+25*n = 0
n*(1/2*n^2+5*n+25) = 0
1/2*n^2+5*n+25 = 0
DELTA = 5^2-(1/2*4*25)
DELTA = -25
DELTA < 0
n = 0
n = 0
n = 0
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