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r in (-oo:+oo)
r^2-(3/2)-10 = 0
r^2-3/2-10 = 0
1*r^2 = 23/2 // : 1
r^2 = 23/2
r^2 = 23/2 // ^ 1/2
abs(r) = (23/2)^(1/2)
r = (23/2)^(1/2) or r = -(23/2)^(1/2)
r in { (23/2)^(1/2), -(23/2)^(1/2) }
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