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If \(a\) is non-negative, is \(x^2 + y^2 > 4a ?\)
(1) \((x + y)^2 = 9a\)
(2) \((x - y)^2 = a\)
Answer: E
Source: Manhattan GMAT
(1) \((x + y)^2 = 9a\)
(2) \((x - y)^2 = a\)
Answer: E
Source: Manhattan GMAT
