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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x-(4/x)-5 = 0
2*x-4*x^-1-5 = 0
2*x^1-4*x^-1-5*x^0 = 0
(2*x^2-5*x^1-4*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2-5*x^1-4*x^0) = 0
x^1
2*x^2-5*x-4 = 0
2*x^2-5*x-4 = 0
DELTA = (-5)^2-(-4*2*4)
DELTA = 57
DELTA > 0
x = (57^(1/2)+5)/(2*2) or x = (5-57^(1/2))/(2*2)
x = (57^(1/2)+5)/4 or x = (5-57^(1/2))/4
x in { (5-57^(1/2))/4, (57^(1/2)+5)/4}
x in { (5-57^(1/2))/4, (57^(1/2)+5)/4 }
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