If x-y=7and xy=9, find the value of (x square +y square
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(X-Y)^2 =x^2 - 2xy +y^2
Therefore ‘
(7)^2 = x^2 -2(9) +y^2
49 = x^2 -18 + y^2
49 +18 = x^2 + y^2
67 = x^2 + y^2
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