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D( x )
x = 0
x^2-(2*x)-24 = 0
x = 0
x = 0
x^2-(2*x)-24 = 0
x^2-(2*x)-24 = 0
x^2-2*x-24 = 0
x^2-2*x-24 = 0
DELTA = (-2)^2-(-24*1*4)
DELTA = 100
DELTA > 0
x = (100^(1/2)+2)/(1*2) or x = (2-100^(1/2))/(1*2)
x = 6 or x = -4
x in (-oo:-4) U (-4:0) U (0:6) U (6:+oo)
((x^2-36)/(x^2-(2*x)-24))*((x+4)/x) = 0
((x^2-36)/(x^2-2*x-24))*((x+4)/x) = 0
((x^2-36)*(x+4))/(x*(x^2-2*x-24)) = 0
x^2-2*x-24 = 0
x^2-2*x-24 = 0
DELTA = (-2)^2-(-24*1*4)
DELTA = 100
DELTA > 0
x = (100^(1/2)+2)/(1*2) or x = (2-100^(1/2))/(1*2)
x = 6 or x = -4
(x+4)*(x-6) = 0
(x^2-36)/(x*(x-6)) = 0
1*x^2 = 36 // : 1
x^2 = 36
x^2 = 36 // ^ 1/2
abs(x) = 6
x = 6 or x = -6
x in { 6}
x = -6
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