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Want to Beat GMAT.
Always do what you're afraid to do. Whoooop GMAT
Always do what you're afraid to do. Whoooop GMAT
2^((x+y)^2) / 2^((x-y)^2)
=2^(x^2 + 2xy + y^2) / 2^(x^2 - 2xy + y^2)
=2^(x^2 + 2xy + y^2 - x^2 + 2xy - y^2)
=2^(4xy)
Since xy = 1
2^(4xy) = 2^4 = 16.
Choose D.
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