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Question
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
8a3 – 2a
Solution
We have,
8a3 – 2a = 2a(4a2 – 1)
= 2a[(2a)2 – (1)2]
= 2a(2a + 1)(2a – 1)
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