Posted by Amanda on Sunday, September 18, 2011 at 4:38pm.
√((x-7)^2 + 12^2) = 13
square both sides and expand
x^2 - 14x + 49 + 144 = 169
x^2 - 14x +24 = 0
(x-12)(x-2) = 0
x = 12 or x = 2
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