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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-9 = 52/x // - 52/x
x-(52/x)-9 = 0
x-52*x^-1-9 = 0
1*x^1-52*x^-1-9*x^0 = 0
(1*x^2-9*x^1-52*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-9*x^1-52*x^0) = 0
x^1
x^2-9*x-52 = 0
x^2-9*x-52 = 0
DELTA = (-9)^2-(-52*1*4)
DELTA = 289
DELTA > 0
x = (289^(1/2)+9)/(1*2) or x = (9-289^(1/2))/(1*2)
x = 13 or x = -4
x in { -4, 13}
x in { -4, 13 }
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