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4*x^2-(((2*x)/2)*x)-1 = 0
4*x^2-x^2-1 = 0
3*x^2 = 1 // : 3
x^2 = 1/3
x^2 = 1/3 // ^ 1/2
abs(x) = (1/3)^(1/2)
x = (1/3)^(1/2) or x = -(1/3)^(1/2)
x in { (1/3)^(1/2), -(1/3)^(1/2) }
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