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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10 = x-(4/x) // - x-(4/x)
4/x-x+10 = 0
4*x^-1-1*x^1+10*x^0 = 0
(10*x^1-1*x^2+4*x^0)/(x^1) = 0 // * x^2
x^1*(10*x^1-1*x^2+4*x^0) = 0
x^1
10*x-x^2+4 = 0
10*x-x^2+4 = 0
DELTA = 10^2-(-1*4*4)
DELTA = 116
DELTA > 0
x = (116^(1/2)-10)/(-1*2) or x = (-116^(1/2)-10)/(-1*2)
x = (2*29^(1/2)-10)/(-2) or x = (-2*29^(1/2)-10)/(-2)
x in { (2*29^(1/2)-10)/(-2), (-2*29^(1/2)-10)/(-2)}
x in { (2*29^(1/2)-10)/(-2), (-2*29^(1/2)-10)/(-2) }
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