Question

X-y=3 and xy=28 than find x2+y2=?

Answer 1

X-Y = 3

(X-Y) ^2 = 3^2

X^2 - 2XY + Y^2 = 9

X^2 - 56 + Y^2 = 9

X^2 + Y^2 = 9 + 56

X^2 + Y^2 = 65.

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