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x in (-oo:+oo)
((1*x)/4)*x = 128 // - 128
((1*x)/4)*x-128 = 0
(x/4)*x-128 = 0
1/4*x^2 = 128 // : 1/4
x^2 = 512
x^2 = 512 // ^ 1/2
abs(x) = 16*2^(1/2)
x = 16*2^(1/2) or x = -(16*2^(1/2))
x in { 16*2^(1/2), -(16*2^(1/2)) }
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