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D( x )
x-9 = 0
x-9 = 0
x-9 = 0
x-9 = 0 // + 9
x = 9
x in (-oo:9) U (9:+oo)
(2*x^3-(33*x^2)+157*x-198)/(x-9) = 0
(2*x^3-33*x^2+157*x-198)/(x-9) = 0
2*x^3-33*x^2+157*x-198 = 0
2*x^3-33*x^2+157*x-198 = 0
{ 1, -1, 2, -2, 3, -3, 6, -6, 9, -9, 11, -11, 18, -18, 22, -22, 33, -33, 66, -66, 99, -99, 198, -198 }
1
x = 1
2*x^3-33*x^2+157*x-198 = -72
1
-1
x = -1
2*x^3-33*x^2+157*x-198 = -390
-1
2
x = 2
2*x^3-33*x^2+157*x-198 = 0
2
x-2
2*x^2-29*x+99
2*x^3-33*x^2+157*x-198
x-2
4*x^2-2*x^3
157*x-29*x^2-198
29*x^2-58*x
99*x-198
198-99*x
0
2*x^2-29*x+99 = 0
DELTA = (-29)^2-(2*4*99)
DELTA = 49
DELTA > 0
x = (49^(1/2)+29)/(2*2) or x = (29-49^(1/2))/(2*2)
x = 9 or x = 11/2
x in { 11/2, 9, 2}
(x-11/2)*(x-9)*(x-2) = 0
(x-11/2)*(x-2) = 0
( x-11/2 )
x-11/2 = 0 // + 11/2
x = 11/2
( x-2 )
x-2 = 0 // + 2
x = 2
x in { 11/2, 2 }
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