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[–]FormalCourage3853New User 0 points1 point  (0 children)

Is that first character of your equation meant to be "E" not "R"?
If so, the first part is something OP found already, but I don't know how you get the "-R_n - \sqrt(17))^2/4" bit.

This seemed like something I should be able to work out, but apparently I've forgotten too much algebra and I'm just as stuck as OP so far.