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Question
Factorise completely: 2a2b2 - 98b4
Sum
Solution
2a2b2 - 98b4 = 2b2 (a2 - 49b2)
= 2b2 [(a)2 - (7b)2]
= 2b2 (a + 7b)(a - 7b)
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Factorising Completely
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