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Question
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
1331x3y – 11y3x
Solution
We have,
1331x3y – 11y3x = (11)3x3y – 11y3x
= 11xy(112x2 – y2)
= 11xy[(11x)2 – y2]
= 11xy(11x + y)(11x – y)
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