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i in (-oo:+oo)
8-(((7*i)/2)*i) = 0
(-7/2)*i^2+8 = 0
-7/2*i^2 = -8 // : -7/2
i^2 = 16/7
i^2 = 16/7 // ^ 1/2
abs(i) = (16/7)^(1/2)
i = (16/7)^(1/2) or i = -(16/7)^(1/2)
i in { (16/7)^(1/2), -(16/7)^(1/2) }
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