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Question
Simplify using identities
(3p + q)(3p – q)
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Solution
(3p + q)(3p – q)
Substitute a = 3p and b = q in
(a + b)(a – b) = a2 – b2, we have
(3p + q)(3p – q) = (3p)2 – q2 = 32p2 – q2
(3P + q)(3p – q) = 9p2 – q2
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