Simplify the following:
(7p+9q)(7p-9q)
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(7p+9q)(7p-9q) = (7p)2 - (9q)2
= 49p2 - 81q2
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(3x-1)2 - (3x-2)(3x+1)
(4x+3y)2 - (4x-3y)2 - 48xy
(2x - y + 3)(2x - y - 3)