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Q2 Factorise

(VI)  

9 x ^2 y^2 - 16

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We have,
              9 x ^2 y^2 - 16 = (3xy)^{2} -(4)^{2}                                                                                                                                                     (using  (a)^{2} -(b)^{2} = (a-b) (a+b))
                                     = (3xy - 4 )(3xy + 4)

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Gautam harsolia

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