Expand the expression(3a - xy)(3a + xy)
A
9a2 - x2y2
B
9a2 + x2y2
C
9a2 - xy
D
9a2 + x2y
Verified Correct Answer: A.
Step-by-Step Mathematical Solution
(3a - xy)(3a + xy); (3a)2 - (xy)2
difference of two sqs; 9a2 - x2y2
Source: Myschool Past Questions Archive (Record #36292)