• Factorise : (64m2 - 144mn + 81n2)- 25p2

The given expression is, 64m2-144mn+81n2-25p2=8m2-2×8m×9n+9n2-5p2=8m-9n2-5p2Now we know that, a2-b2=a-ba+b=8m-9n-5p8m-9n+5p

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