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Question
Factorise: 4x2 - 81y2
Sum
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Solution
4x2 - 81y2
= (2x)2 – (9y)2
= (2x + 9y) (2x – 9y) ...[a2 – b2 = (a + b) (a – b)]
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Factorisation by Difference of Two Squares
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