Evaluate:
(2a + 3) (2a - 3)
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Using the formula
[∵ (x + y)(x - y) = x2 - y2]
= (2a)2 - 32
= 4a2 - 9
Hence, (2a + 3) (2a - 3) = 4a2 - 9
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Use direct method to evaluate the following product:
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(xy + 4) (xy - 4)
(ab + x2) (ab - x2)