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i in (-oo:+oo)
8-(((9*i)/4)*i) = 0
(-9/4)*i^2+8 = 0
-9/4*i^2 = -8 // : -9/4
i^2 = 32/9
i^2 = 32/9 // ^ 1/2
abs(i) = (32/9)^(1/2)
i = (32/9)^(1/2) or i = -(32/9)^(1/2)
i in { (32/9)^(1/2), -(32/9)^(1/2) }
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