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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
1/m-5 = (7/2)*m // - (7/2)*m
1/m-((7/2)*m)-5 = 0
(-7/2)*m+1/m-5 = 0
1*m^-1-7/2*m^1-5*m^0 = 0
(1*m^0-7/2*m^2-5*m^1)/(m^1) = 0 // * m^2
m^1*(1*m^0-7/2*m^2-5*m^1) = 0
m^1
(-7/2)*m^2-5*m+1 = 0
(-7/2)*m^2-5*m+1 = 0
DELTA = (-5)^2-(1*4*(-7/2))
DELTA = 39
DELTA > 0
m = (39^(1/2)+5)/(2*(-7/2)) or m = (5-39^(1/2))/(2*(-7/2))
m = (39^(1/2)+5)/(-7) or m = (5-39^(1/2))/(-7)
m in { (39^(1/2)+5)/(-7), (5-39^(1/2))/(-7)}
m in { (39^(1/2)+5)/(-7), (5-39^(1/2))/(-7) }
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