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D( m )
m-1 = 0
m-1 = 0
m-1 = 0
m-1 = 0 // + 1
m = 1
m in (-oo:1) U (1:+oo)
(2*m^3-(7*m^2)+2*m+3)/(m-1) = 0
(2*m^3-7*m^2+2*m+3)/(m-1) = 0
2*m^3-7*m^2+2*m+3 = 0
2*m^3-7*m^2+2*m+3 = 0
{ 1, -1, 3, -3 }
1
m = 1
2*m^3-7*m^2+2*m+3 = 0
1
m-1
2*m^2-5*m-3
2*m^3-7*m^2+2*m+3
m-1
2*m^2-2*m^3
2*m-5*m^2+3
5*m^2-5*m
3-3*m
3*m-3
0
2*m^2-5*m-3 = 0
DELTA = (-5)^2-(-3*2*4)
DELTA = 49
DELTA > 0
m = (49^(1/2)+5)/(2*2) or m = (5-49^(1/2))/(2*2)
m = 3 or m = -1/2
m in { -1/2, 3, 1}
(m+1/2)*(m-3)*(m-1) = 0
(m+1/2)*(m-3) = 0
( m+1/2 )
m+1/2 = 0 // - 1/2
m = -1/2
( m-3 )
m-3 = 0 // + 3
m = 3
m in { -1/2, 3 }
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