Factorise A. 9(x-2y)^2-1
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Posted by Tanya Chauhan 4 years, 4 months ago
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Yogita Ingle 4 years, 4 months ago
9(x-2y)2-1
= 9 ( x2 - 4xy + 4y2)- 1
= 9x2 - 36xy + 36y2 - 1
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