1.

Factorise 21³+432 m³​

Answer»

Step-by-step EXPLANATION:

a³+b³=(a+b)(a²+b²-ab)

21³+432m³

=2[ l³+216m³]

=2[(L)³+(6M)³]

=2[(l+6m){(l)²+(6m)²-(l)×(6m)}]

=2(l+6m)(l²+36²-6lm)



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