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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
14 = 2*x-(5/x)+2 // - 2*x-(5/x)+2
5/x-(2*x)-2+14 = 0
5/x-2*x-2+14 = 0
5*x^-1-2*x^1+12*x^0 = 0
(12*x^1-2*x^2+5*x^0)/(x^1) = 0 // * x^2
x^1*(12*x^1-2*x^2+5*x^0) = 0
x^1
12*x-2*x^2+5 = 0
12*x-2*x^2+5 = 0
DELTA = 12^2-(-2*4*5)
DELTA = 184
DELTA > 0
x = (184^(1/2)-12)/(-2*2) or x = (-184^(1/2)-12)/(-2*2)
x = (2*46^(1/2)-12)/(-4) or x = (-2*46^(1/2)-12)/(-4)
x in { (2*46^(1/2)-12)/(-4), (-2*46^(1/2)-12)/(-4)}
x in { (2*46^(1/2)-12)/(-4), (-2*46^(1/2)-12)/(-4) }
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