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= 3(25 - 7)
= 3.18
= 54
x^2 + y^2 = (5 + √7)^2 + (5 - √7)^2
= (25 + 10√7 + 7) + (25 - 10√7 + 7)
= 25 + 25 + 7 + 7 + 10√7 - 10√7
= 50 + 14
= 64