If a(x + y) = b(x - y) = 2ab, then the value of 2(x2 + y2) is

If a(x + y) = b(x - y) = 2ab, then the value of 2(x2 + y2) is
1). 2(a2 - b2)
2). 2(a2 + b2)
3). 4(a2 - b2)
4). 4(a2 + b2)

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