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Factorise: 4x2

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in General by kratos

Factorise: 4x2 - 81y2

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by kratos
 
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4x2 - 81y2

= (2x)2 (9y)2

= (2x + 9y) (2x 9y) ...[a2 b2= (a + b) (a b)]

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