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September 22, 2014

September 22, 2014

Posted by **Loki** on Friday, August 9, 2013 at 9:06am.

(r-2)^2 + (8 - r)^2 = (r + 2)^2

- Math -
**Reiny**, Friday, August 9, 2013 at 10:07amexpand, 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

(r-12)^2 = 80

r-12 = ±√80

r = 12 ± 4√5

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