Expand the expression(3a – xy)(3a + xy)
-
A.
9a2 – x2y2 -
B.
9a2 + x2y2 -
C.
9a2 – xy -
D.
9a2 + x2y
Correct Answer: Option A
Explanation
(3a – xy)(3a + xy); (3a)2 – (xy)2
difference of two sqs; 9a2 – x2y2
(3a – xy)(3a + xy); (3a)2 – (xy)2
difference of two sqs; 9a2 – x2y2