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`9x^(2)-49y^(2)` के गुणनखण्ड कीजिए |

Answer» `9x^(2)-49y^(2)=(3x)^(2)-(7y)^(2)`
`=(3x-7y)(3x+7y) " " [because a^(2)-b^(2)=(a-b)(a+b)]`


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