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Factorise 21³+432 m³ |
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Answer» Step-by-step EXPLANATION: a³+b³=(a+b)(a²+b²-ab) 21³+432m³ =2[ l³+216m³] =2[(l+6m){(l)²+(6m)²-(l)×(6m)}] =2(l+6m)(l²+36²-6lm) |
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