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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x^2-(2*x)-24)*(1/x-1) = 0
(2*x^2-2*x-24)*(1/x-1) = 0
(2*x^2-2*x-24)*(x^-1-1) = 0
2*x^2-2*x-24 = 0
2*(x^2-x-12) = 0
x^2-x-12 = 0
DELTA = (-1)^2-(-12*1*4)
DELTA = 49
DELTA > 0
x = (49^(1/2)+1)/(1*2) or x = (1-49^(1/2))/(1*2)
x = 4 or x = -3
2*(x+3)*(x-4) = 0
2*(x+3)*(x-4)*(x^-1-1) = 0
( 2 )
2 = 0
x belongs to the empty set
( x+3 )
x+3 = 0 // - 3
x = -3
( x-4 )
x-4 = 0 // + 4
x = 4
( x^-1-1 )
1*x^-1 = 1 // : 1
x^-1 = 1
-1 < 0
1/(x^1) = 1 // * x^1
1 = 1*x^1 // : 1
1 = x^1
x = 1
x in { -3, 4, 1 }
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