Q1 of 41 Page 31

Factorise.

24a3 + 81b3

We know that


- - - - - (i)


Taking 3 as common, we get


3; solving only bracket term first,


Here a = 2a, b = 3b; putting values in eq.i




}


Applying


}


}


Ans: - 3}


Note: Must memorize cubes upto 12


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