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(1/2)*x^2-(9/16) = 0
(1/2)*x^2-9/16 = 0
1/2*x^2 = 9/16 // : 1/2
x^2 = 9/8
x^2 = 9/8 // ^ 1/2
abs(x) = (9/8)^(1/2)
x = (9/8)^(1/2) or x = -(9/8)^(1/2)
x in { (9/8)^(1/2), -(9/8)^(1/2) }
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