Posted by Loki on Friday, August 9, 2013 at 9:06am.
How do you solve for r, please show steps
(r2)^2 + (8  r)^2 = (r + 2)^2

Math  Reiny, Friday, August 9, 2013 at 10:07am
expand, simplify, then write it in standard form
r^2  4r + 4 + 64  16r + r^2 = r^2 + 4r + 4
r^2 24r +64 = 0
solving by completing the square, easiest way in this case.
r^2  24r + 144 = 144  64
(r12)^2 = 80
r12 = ±√80
r = 12 ± 4√5
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