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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(5/x)-10 = 0
x-5*x^-1-10 = 0
1*x^1-5*x^-1-10*x^0 = 0
(1*x^2-10*x^1-5*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-10*x^1-5*x^0) = 0
x^1
x^2-10*x-5 = 0
x^2-10*x-5 = 0
DELTA = (-10)^2-(-5*1*4)
DELTA = 120
DELTA > 0
x = (120^(1/2)+10)/(1*2) or x = (10-120^(1/2))/(1*2)
x = (2*30^(1/2)+10)/2 or x = (10-2*30^(1/2))/2
x in { (10-2*30^(1/2))/2, (2*30^(1/2)+10)/2}
x in { (10-2*30^(1/2))/2, (2*30^(1/2)+10)/2 }
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