Expand the expression(3a – xy)(3a + xy)

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Mathematics WAEC 2007

Expand the expression(3a – xy)(3a + xy)

  • 9a2 - x2y2 checkmark
  • 9a2 + x2y2
  • 9a2 - xy
  • 9a2 + x2y

The correct answer is: A

Explanation

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

difference of two sqs; 9a2 - x2y2
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