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Question
Using the identity (a + b)(a – b) = a2 – b2, find the following product
(p + 2)(p – 2)
Solution
(p + 2)(p – 2)
Substituting a = p, b = 2
In (a + b)(a – b) = a2 – b2, we get
(p + 2)(p – 2) = p2 – 22
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