Factorise `a^(2)-9b^(2)`. – InterviewSolution

InterviewSolution

1.	Factorise `a^(2)-9b^(2)`.
Answer» Given expression : `a^(2)=9b^(2)=(a)^(2)-(3b)^(2) " " [because x^(2)-y^(2)=(x+y)(x-y)]` =(a+3b)(a-3b)

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