Factorise using identity - : 81 x square - 4 y square – InterviewSolution

1.	Factorise using identity - : 81 x square - 4 y square
Answer» we KNOW that- ( a+B) ( a- b) = a^2 -b^2= ( 9X)^2 - (2Y ) ^2 =(9x +2y) ( 9x - 2y)

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