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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*(4/x) = x-2 // - x-2
2*(4/x)-x+2 = 0
8*x^-1-1*x^1+2*x^0 = 0
(2*x^1-1*x^2+8*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^1-1*x^2+8*x^0) = 0
x^1
2*x-x^2+8 = 0
2*x-x^2+8 = 0
DELTA = 2^2-(-1*4*8)
DELTA = 36
DELTA > 0
x = (36^(1/2)-2)/(-1*2) or x = (-36^(1/2)-2)/(-1*2)
x = -2 or x = 4
x in { -2, 4}
x in { -2, 4 }
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