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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4*x = 256/x // - 256/x
4*x-(256/x) = 0
4*x-256*x^-1 = 0
4*x^1-256*x^-1 = 0
(4*x^2-256*x^0)/(x^1) = 0 // * x^2
x^1*(4*x^2-256*x^0) = 0
x^1
4*x^2-256 = 0
4*x^2-256 = 0
DELTA = 0^2-(-256*4*4)
DELTA = 4096
DELTA > 0
x = (4096^(1/2)+0)/(2*4) or x = (0-4096^(1/2))/(2*4)
x = 8 or x = -8
x in { -8, 8}
x in { -8, 8 }
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