TBQ - Evaluate using cubic identity — task. Maths CBSE Mentoring, Class 9 Mentoring product.

Factorise: \(27x^3 + y^3 + z^3 – 9xyz\)

\(27x^3 + y^3 + z^3 – 9xyz=\)

\( (3x - y - z) (9x^2 + y^2 + z^2 – 6xy –2 yz – 6xz)\)
\( (3x - y - z) (9x^2 +y^2 + z^2 – 3xy – yz – 3xz)\)
\( (3x + y + z) (9x^2 + y^2 + z^2 – 3xy – yz – 3xz)\)
\( (3x + y + z) (3x^2 + y^2 + z^2 – 6xy – 2yz – 6xz)\)

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