After appropriate substitution, the integral expression a* (x2 + 4)? dx can be express as (choose 2 correct answer, no partial points)

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Q: If x^2 + y^2 =14 and x+y=6, find xy.

A: Solution :  Given that   x2 + y2 = 14    ---(1) and  x + y = 6   ---(2)

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