Q. 94.2( 15 Votes )

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Answer :

We have,


20a2 – 45b2


= 5(4a2 – 9b2)


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


We get,


20a2 – 45b2 = 5(4a2 – 9b2)


= 5{(2a)2 – (3b)2}


= 5(2a + 3b)(2a – 3b)


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