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