If x+y = 12 and xy = 14, find the value of x² + y².
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(x+y)²=x²+y²+2xy
(12)²=x²+y²+2(14)
144=x²+y²+28
x²+y²=144-28
x²+y²=116
(12)²=x²+y²+2(14)
144=x²+y²+28
x²+y²=144-28
x²+y²=116
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