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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
m+18/m = 5/2 // - 5/2
m+18/m-(5/2) = 0
m+18/m-5/2 = 0
1*m^1+18*m^-1-5/2*m^0 = 0
(1*m^2-5/2*m^1+18*m^0)/(m^1) = 0 // * m^2
m^1*(1*m^2-5/2*m^1+18*m^0) = 0
m^1
m^2+(-5/2)*m+18 = 0
m^2+(-5/2)*m+18 = 0
DELTA = (-5/2)^2-(1*4*18)
DELTA = -263/4
DELTA < 0
m in { }
m belongs to the empty set
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