factorise a^2-81b^4.....
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a^2-81b^4=(a)2-(9b^2)2
Use a2-b2=(a+b) (a-b)
=(a+9b^2)(a-9b^2)
Use a2-b2=(a+b) (a-b)
=(a+9b^2)(a-9b^2)
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