(a-b)^2 = 12^2
a^2 + b^2 - 2ab = 144
a^2 + b^2 - 2 x 14 = 144
a^2 + b^2 - 28 = 144
a^2 + b^2 = 144 + 28
a^2 + b^2 = 172
a^2 + b^2 +ab = 172 +ab
a^2 + b^2 +ab = 186
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