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y in (-oo:+oo)
y*y-(61/4) = 0
y*y-61/4 = 0
1*y^2 = 61/4 // : 1
y^2 = 61/4
y^2 = 61/4 // ^ 1/2
abs(y) = (61/4)^(1/2)
y = (61/4)^(1/2) or y = -(61/4)^(1/2)
y in { (61/4)^(1/2), -(61/4)^(1/2) }
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