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What is the factorised form of (125m^3+216n^3)?

Answer and explanation

Correct answer: ( (5m+6n)(25m^2-30mn+36n^2) )

The direct mathematical answer is C: \((5m+6n)(25m^2-30mn+36n^2)\), but the supplied key should be checked carefully because this is a sum of cubes. We have \(125m^3=(5m)^3\) and \(216n^3=(6n)^3\). Using \(a^3+b^3=(a+b)(a^2-ab+b^2)\), we obtain \((5m+6n)(25m^2-30mn+36n^2)\), so C is correct. Option A has \(5m-6n\), which belongs to a difference pattern and is wrong for a sum. Option B has the correct first factor but a positive middle term; that would produce the wrong mixed terms. Option C has the correct first factor, negative middle term, and both square terms. Option D uses 125 and 216 directly instead of their cube roots and is not the identity. Memory cue: sum of cubes means plus in the first bracket and minus in the middle of the second.

Related tags

Sum Of CubesIdentityFactorisation

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