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Subjects
Class 9MathematicsExploring Algebraic IdentitiesFactorisationMediumLevel 70
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Which is the correct factorisation of (b^3-27)?

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Answer and explanation

Correct answer: ( (b-3)(b^2+3b+9) )

Here (27=3^3) and it is a difference of cubes. Exam tip: in (a^3-b^3), the second bracket is (a^2+ab+b^2).

Related tags

Difference Of CubesIdentityFactorisation

Frequently asked questions

What is the correct answer to this question?

( (b-3)(b^2+3b+9) )

Why is this the correct answer?

Here (27=3^3) and it is a difference of cubes. Exam tip: in (a^3-b^3), the second bracket is (a^2+ab+b^2).

Which subject and chapter does this question cover?

This is a Class 9 Mathematics question. Chapter: Exploring Algebraic Identities. Topic: Factorisation.

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  4. 4Choose the correct factorisation of (5m-15).
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  6. 6Which of the following expressions is a difference of two squares and can be factorised using the identity?
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  8. 8Which is the correct factorisation of (x^2-16)?
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