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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
30*x-11 = 30/x // - 30/x
30*x-(30/x)-11 = 0
30*x-30*x^-1-11 = 0
30*x^1-30*x^-1-11*x^0 = 0
(30*x^2-11*x^1-30*x^0)/(x^1) = 0 // * x^2
x^1*(30*x^2-11*x^1-30*x^0) = 0
x^1
30*x^2-11*x-30 = 0
30*x^2-11*x-30 = 0
DELTA = (-11)^2-(-30*4*30)
DELTA = 3721
DELTA > 0
x = (3721^(1/2)+11)/(2*30) or x = (11-3721^(1/2))/(2*30)
x = 6/5 or x = -5/6
x in { -5/6, 6/5}
x in { -5/6, 6/5 }
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