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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
m^2-((8*m)/m)-2 = 0
m^2-8-2 = 0
1*m^2 = 10 // : 1
m^2 = 10
m^2 = 10 // ^ 1/2
abs(m) = 10^(1/2)
m = 10^(1/2) or m = -10^(1/2)
m in { 10^(1/2), -10^(1/2) }
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