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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(5*x)/(x^2)-(11*x) = 1 // - 1
(5*x)/(x^2)-(11*x)-1 = 0
(5*x)/(x^2)-11*x-1 = 0
5*x^-1-11*x^1-1*x^0 = 0
(5*x^0-11*x^2-1*x^1)/(x^1) = 0 // * x^2
x^1*(5*x^0-11*x^2-1*x^1) = 0
x^1
5-11*x^2-x = 0
5-11*x^2-x = 0
DELTA = (-1)^2-(-11*4*5)
DELTA = 221
DELTA > 0
x = (221^(1/2)+1)/(-11*2) or x = (1-221^(1/2))/(-11*2)
x = (221^(1/2)+1)/(-22) or x = (1-221^(1/2))/(-22)
x in { (221^(1/2)+1)/(-22), (1-221^(1/2))/(-22)}
x in { (221^(1/2)+1)/(-22), (1-221^(1/2))/(-22) }
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