Posted by carlos on Saturday, December 1, 2012 at 8:46pm.
(x+4)^2 = x^2 + (x-4)^2
x^2 + 8 x + 16 = x^2 + x^2 - 8 x + 16
x^2 -16 x = 0
x = 0 or x = 16
so x = 16
12, 16, 20
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