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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
9*(3*m+2/m)-(30*(3*m+2/m))+25 = 0
9*(3*m+2/m)-30*(3*m+2/m)+25 = 0
9*(3*m+2*m^-1)-30*(3*m+2*m^-1)+25 = 0
9*(3*m+2*m^-1)-30*(3*m+2*m^-1)+25 = 0
25-63*m-42*m^-1 = 0
25-63*m-42*m^-1 = 0
25*m^0-63*m^1-42*m^-1 = 0
(25*m^1-63*m^2-42*m^0)/(m^1) = 0 // * m^2
m^1*(25*m^1-63*m^2-42*m^0) = 0
m^1
25*m-63*m^2-42 = 0
25*m-63*m^2-42 = 0
DELTA = 25^2-(-63*(-42)*4)
DELTA = -9959
DELTA < 0
m in { }
1 = 0
1 = 0
m belongs to the empty set
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