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