Sum
Factorise completely: a2 -16b2 - 2a - 8b
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Solution
a2 -16b2 - 2a - 8b = [(a)4 - (4b)2] - 2(a + 4b)
= (a + 4b)(a - 4b) - 2(a + 4b)
= (a + 4b)(a - 4b - 2)
Concept: Factorising Completely
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