14, If x + y = 12 and xy = 14, find the value of (x²+y').
15. If x - y = 7 and xy =9, find the value of (x²+y?).
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(x+y)^2=x^2+y^2+2xy=
144=x^2+y^2+28
=x^2+y^2=116
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