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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
16*x-(1/x) = 0
16*x-x^-1 = 0
16*x^1-1*x^-1 = 0
(16*x^2-1*x^0)/(x^1) = 0 // * x^2
x^1*(16*x^2-1*x^0) = 0
x^1
16*x^2-1 = 0
16*x^2-1 = 0
DELTA = 0^2-(-1*4*16)
DELTA = 64
DELTA > 0
x = (64^(1/2)+0)/(2*16) or x = (0-64^(1/2))/(2*16)
x = 1/4 or x = -1/4
x in { -1/4, 1/4}
x in { -1/4, 1/4 }
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