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Question
Factorise: (a - 3b)2 - 36 b2
Sum
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Solution
(a - 3b)2 - 36 b2
= (a - 3b)2 - (6b)2
= (a - 3b + 6b) (a - 3b - 6b)
= (a + 3b)(a - 9b) ....[a2 - b2 = (a + b)(a - b)]
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Factorisation by Difference of Two Squares
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