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X in (-oo:+oo)
6-(((11-8)*X^2)/100) = 0
-3/100*X^2 = -6 // : -3/100
X^2 = 200
X^2 = 200 // ^ 1/2
abs(X) = 10*2^(1/2)
X = 10*2^(1/2) or X = -(10*2^(1/2))
X in { 10*2^(1/2), -(10*2^(1/2)) }
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