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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-(x/121) = 0
1*x^-1-1/121*x^1 = 0
(1*x^0-1/121*x^2)/(x^1) = 0 // * x^2
x^1*(1*x^0-1/121*x^2) = 0
x^1
(-1/121)*x^2+1 = 0
(-1/121)*x^2+1 = 0
DELTA = 0^2-(1*4*(-1/121))
DELTA = 4/121
DELTA > 0
x = ((4/121)^(1/2)+0)/(2*(-1/121)) or x = (0-(4/121)^(1/2))/(2*(-1/121))
x = -11 or x = 11
x in { -11, 11}
x in { -11, 11 }
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