Q. 155.0( 10 Votes )

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Answer :

We have,


63a2b2 – 7


= 7(9a2b2 – 1)


By using the formula a2 – b2 = (a + b)(a – b)


We get,


63a2b2 – 7 = 7(9a2b2 – 1)


= 7{(3ab)2 – (1)2}


= 7(3ab + 1)(3ab – 1)


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