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x in (-oo:+oo)
b = 3.14*(1/4)*m*x^2 // - 3.14*(1/4)*m*x^2
b-(3.14*(1/4)*m*x^2) = 0
b-0.785*m*x^2 = 0
-0.785*m*x^2 = -b // : -0.785*m
x^2 = 1.27388535*b*m^-1
x^2 = 1.27388535*b*m^-1 // ^ 1/2
abs(x) = 1.27388535^(1/2)*b^(1/2)*m^(-1/2)
x = 1.27388535^(1/2)*b^(1/2)*m^(-1/2) or x = -(1.27388535^(1/2)*b^(1/2)*m^(-1/2))
x in { 1.27388535^(1/2)*b^(1/2)*m^(-1/2), -(1.27388535^(1/2)*b^(1/2)*m^(-1/2)) }
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