(3m+ n) (3m–n) =9m²-n²
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Step-by-step explanation:
LHS=(3m+ n) (3m–n)
3m(3m-n)+n(3m-n)
=3m×3m-3m×n+n×3m-n×n
=9m²-3mn+3mn-n²
=9m²-n²(RHS)
LHS=RHS
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