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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x-(24/x)-8 = 0
2*x-24*x^-1-8 = 0
2*x^1-24*x^-1-8*x^0 = 0
(2*x^2-8*x^1-24*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2-8*x^1-24*x^0) = 0
x^1
2*x^2-8*x-24 = 0
2*x^2-8*x-24 = 0
DELTA = (-8)^2-(-24*2*4)
DELTA = 256
DELTA > 0
x = (256^(1/2)+8)/(2*2) or x = (8-256^(1/2))/(2*2)
x = 6 or x = -2
x in { -2, 6}
x in { -2, 6 }
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