12^2 + 12 = 144 + 12 = 156 or,
12^2 + 12 = 12(12 + 1) = (12)(13) = 156
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12 squared plus 18 squared is equal to 468.
X = √63
If I have this correct you are asking x^2 + 10^2 = 12^2 Then x=6.633249507108
6 squared plus 9 squared is equal to 117.
Assuming you mean x squared plus 5x squared... the answer is 6x squared.