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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+x-(2/x)-16 = 0
x+x-2*x^-1-16 = 0
2*x^1-2*x^-1-16*x^0 = 0
(2*x^2-16*x^1-2*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2-16*x^1-2*x^0) = 0
x^1
2*x^2-16*x-2 = 0
2*x^2-16*x-2 = 0
DELTA = (-16)^2-(-2*2*4)
DELTA = 272
DELTA > 0
x = (272^(1/2)+16)/(2*2) or x = (16-272^(1/2))/(2*2)
x = (4*17^(1/2)+16)/4 or x = (16-4*17^(1/2))/4
x in { (16-4*17^(1/2))/4, (4*17^(1/2)+16)/4}
x in { (16-4*17^(1/2))/4, (4*17^(1/2)+16)/4 }
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