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What is the correct factorisation of (216p^3-125q^3)?

Answer and explanation

Correct answer: ( (6p-5q)(36p^2+30pq+25q^2) )

This is again a difference of cubes. The first term is 216p³=(6p)³, and the second is 125q³=(5q)³. Applying \(a^3-b^3=(a-b)(a^2+ab+b^2)\) with a=6p and b=5q gives \( (6p-5q)(36p^2+30pq+25q^2)\). Therefore option A is correct.

To verify, the first factor supplies the difference of the cube roots, while the second factor contains the squares and positive cross-product: \( (6p)^2=36p^2\), \( (6p)(5q)=30pq\), and \( (5q)^2=25q^2\). The second factor must have all positive signs for a difference of cubes. Option B has the wrong signs, option C uses incorrect cube roots, and option D is the cube of a binomial rather than the difference-of-cubes identity. The supplied factorisation matches the standard rule exactly.

Related tags

Difference Of CubesFactorisation216P Cube

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