factor 81m^2-729m^3-49n^2+343n^3

factor the polynomial
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1 Answer

343n³-729m³=(7n)³-(9m³)=(7n-9m)(49n²+63mn+81m²).

81m²-49n²=(9m-7n)(9m+7n)=-(7n-9m)(7n+9m).

Therefore we have common factor 7n-9m.

Complete factorisation:

(7n-9m)(49n²+63mn+81m²-7n-9m).

by Top Rated User (1.1m points)

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