Factorise the following:-
81p²-4m²-n²+ 4mm
who will give answer I will mark him brilliant star
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Step-by-step explanation:
81p²-4m²-n²+4mn
=81p²-(4m²-4mn+n²)
=81p²-{(2m)²-2.2m.n+n²}
=81p²-(2m-n)²
=(9p)²-(2m-n)²
=(9p+2m-n)(9p-2m+n)
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