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x in (-oo:+oo)
(1/98)*x^2-150 = 0
1/98*x^2 = 150 // : 1/98
x^2 = 14700
x^2 = 14700 // ^ 1/2
abs(x) = 70*3^(1/2)
x = 70*3^(1/2) or x = -(70*3^(1/2))
x in { 70*3^(1/2), -(70*3^(1/2)) }
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