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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5*x+5/x-1 = 10 // - 10
5*x+5/x-10-1 = 0
5*x^1+5*x^-1-11*x^0 = 0
(5*x^2-11*x^1+5*x^0)/(x^1) = 0 // * x^2
x^1*(5*x^2-11*x^1+5*x^0) = 0
x^1
5*x^2-11*x+5 = 0
5*x^2-11*x+5 = 0
DELTA = (-11)^2-(4*5*5)
DELTA = 21
DELTA > 0
x = (21^(1/2)+11)/(2*5) or x = (11-21^(1/2))/(2*5)
x = (21^(1/2)+11)/10 or x = (11-21^(1/2))/10
x in { (11-21^(1/2))/10, (21^(1/2)+11)/10}
x in { (11-21^(1/2))/10, (21^(1/2)+11)/10 }
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