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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
24*x-55 = 24/x // - 24/x
24*x-(24/x)-55 = 0
24*x-24*x^-1-55 = 0
24*x^1-24*x^-1-55*x^0 = 0
(24*x^2-55*x^1-24*x^0)/(x^1) = 0 // * x^2
x^1*(24*x^2-55*x^1-24*x^0) = 0
x^1
24*x^2-55*x-24 = 0
24*x^2-55*x-24 = 0
DELTA = (-55)^2-(-24*4*24)
DELTA = 5329
DELTA > 0
x = (5329^(1/2)+55)/(2*24) or x = (55-5329^(1/2))/(2*24)
x = 8/3 or x = -3/8
x in { -3/8, 8/3}
x in { -3/8, 8/3 }
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