xy=1 then what is (7^(x+y)^2) / (7^(x-y)^2)  Choose the correct answer.
A) 2401  B) 4  C) 8  D) 16  E) 32
(x+y)^2 - (x-y)^2   (x+y+x-y)(x+y-x+y)   (2x)(2y)   4xy   4   7^4 = 2401   2401nswer 2401
<result>A</result>
xy=1 then what is (7^(x+y)^2) / (7^(x-y)^2)