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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
(2*m)/5 = 10/m // - 10/m
(2*m)/5-(10/m) = 0
(2*m)/5-10*m^-1 = 0
2/5*m^1-10*m^-1 = 0
(2/5*m^2-10*m^0)/(m^1) = 0 // * m^2
m^1*(2/5*m^2-10*m^0) = 0
m^1
(2/5)*m^2-10 = 0
(2/5)*m^2-10 = 0
DELTA = 0^2-(-10*4*(2/5))
DELTA = 16
DELTA > 0
m = (16^(1/2)+0)/(2*(2/5)) or m = (0-16^(1/2))/(2*(2/5))
m = 5 or m = -5
m in { -5, 5}
m in { -5, 5 }
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