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D( m )
m^2-(6*m)+9 = 0
m^2-(6*m)+9 = 0
m^2-(6*m)+9 = 0
m^2-6*m+9 = 0
m^2-6*m+9 = 0
DELTA = (-6)^2-(1*4*9)
DELTA = 0
m = 6/(1*2)
m = 3 or m = 3
m in (-oo:3) U (3:+oo)
(m^2-9)/(m^2-(6*m)+9) = 0
(m^2-9)/(m^2-6*m+9) = 0
m^2-6*m+9 = 0
m^2-6*m+9 = 0
DELTA = (-6)^2-(1*4*9)
DELTA = 0
m = 6/(1*2)
m = 3 or m = 3
(m-3)^2 = 0
(m^2-9)/((m-3)^2) = 0
1*m^2 = 9 // : 1
m^2 = 9
m^2 = 9 // ^ 1/2
abs(m) = 3
m = 3 or m = -3
m in { 3}
m = -3
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