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x in (-oo:+oo)
x-(16*(x/64)^2) = 0
x-16*(x/64)^2 = 0
x-1/256*x^2 = 0
DELTA = 1^2-(-1/256*0*4)
DELTA = 1
DELTA > 0
x = (1^(1/2)-1)/(-1/256*2) or x = (-1^(1/2)-1)/(-1/256*2)
x = 0 or x = 256
x in { 0, 256 }
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