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WAEC - Mathematics (2007 - No. 52)
Expand the expression(3a - xy)(3a + xy)
9a
2
- x
2
y
2
9a
2
+ x
2
y
2
9a
2
- xy
9a
2
+ x
2
y
Paliwanag
(3a - xy)(3a + xy); (3a)
2
- (xy)
2
difference of two sqs; 9a
2
- x
2
y
2
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