Q. 34.2( 9 Votes )

Factories:

81 – 49x2

Answer :

We have,


81 – 49x2


= (9)2 – (7x)2


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


We get,


81 – 49x2 = (9)2 – (7x)2


= (9 + 7x)(9 – 7x)


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