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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*5*x-(23*x)+5/x-5 = 0
2*5*x-23*x+5/x-5 = 0
5*x^-1-13*x^1-5*x^0 = 0
(5*x^0-13*x^2-5*x^1)/(x^1) = 0 // * x^2
x^1*(5*x^0-13*x^2-5*x^1) = 0
x^1
5-13*x^2-5*x = 0
5-13*x^2-5*x = 0
DELTA = (-5)^2-(-13*4*5)
DELTA = 285
DELTA > 0
x = (285^(1/2)+5)/(-13*2) or x = (5-285^(1/2))/(-13*2)
x = (285^(1/2)+5)/(-26) or x = (5-285^(1/2))/(-26)
x in { (285^(1/2)+5)/(-26), (5-285^(1/2))/(-26)}
x in { (285^(1/2)+5)/(-26), (5-285^(1/2))/(-26) }
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