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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x-5 = x // - x
3/x-x-5 = 0
3*x^-1-1*x^1-5*x^0 = 0
(3*x^0-1*x^2-5*x^1)/(x^1) = 0 // * x^2
x^1*(3*x^0-1*x^2-5*x^1) = 0
x^1
3-x^2-5*x = 0
3-x^2-5*x = 0
DELTA = (-5)^2-(-1*3*4)
DELTA = 37
DELTA > 0
x = (37^(1/2)+5)/(-1*2) or x = (5-37^(1/2))/(-1*2)
x = (37^(1/2)+5)/(-2) or x = (5-37^(1/2))/(-2)
x in { (37^(1/2)+5)/(-2), (5-37^(1/2))/(-2)}
x in { (37^(1/2)+5)/(-2), (5-37^(1/2))/(-2) }
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