Expand the expression(3a - xy)(3a + xy)
9a2 - x2y2
9a2 + x2y2
9a2 - xy
9a2 + x2y
Correct answer is A
(3a - xy)(3a + xy); (3a)2 - (xy)2 difference of two sqs; 9a2 - x2y2
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