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WAEC - Mathematics (2007 - No. 52)

Expand the expression(3a - xy)(3a + xy)
9a2 - x2y2
9a2 + x2y2
9a2 - xy
9a2 + x2y

Forklaring

(3a - xy)(3a + xy); (3a)2 - (xy)2

difference of two sqs; 9a2 - x2y2

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