Posted by Bart on Thursday, October 18, 2012 at 4:07pm.
assuming you want to solve for r, square both sides to get
20-r = r^2
r^2 + r - 20 = 0
(r+5)(r-4) = 0
and it's all downhill from there.
Just remember: √25 = 5, not -5
Thank you!
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