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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
24/x = 4*x // - 4*x
24/x-(4*x) = 0
24/x-4*x = 0
24*x^-1-4*x^1 = 0
(24*x^0-4*x^2)/(x^1) = 0 // * x^2
x^1*(24*x^0-4*x^2) = 0
x^1
24-4*x^2 = 0
24-4*x^2 = 0
DELTA = 0^2-(-4*4*24)
DELTA = 384
DELTA > 0
x = (384^(1/2)+0)/(-4*2) or x = (0-384^(1/2))/(-4*2)
x = -6^(1/2) or x = 6^(1/2)
x in { -6^(1/2), 6^(1/2)}
x in { -6^(1/2), 6^(1/2) }
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