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i in (-oo:+oo)
2-(((5*i)/4)*i) = 0
(-5/4)*i^2+2 = 0
-5/4*i^2 = -2 // : -5/4
i^2 = 8/5
i^2 = 8/5 // ^ 1/2
abs(i) = (8/5)^(1/2)
i = (8/5)^(1/2) or i = -(8/5)^(1/2)
i in { (8/5)^(1/2), -(8/5)^(1/2) }
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