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x in (-oo:+oo)
0 = 228-((x^2)/57) // - 228-((x^2)/57)
(x^2)/57-228+0 = 0
(x^2)/57-228 = 0
1/57*x^2 = 228 // : 1/57
x^2 = 12996
x^2 = 12996 // ^ 1/2
abs(x) = 114
x = 114 or x = -114
x in { 114, -114 }
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