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Factorise 49x^(2) - 16y^(2)....

Factorise `49x^(2) - 16y^(2)`.

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The correct Answer is:
`49x^(2) - 16 y ^(2) = (7x) ^(2) = (7x+ 4y) (7x-4)y.`
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  • Factorise x^(2)-6x-y^(2)+9 .

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