Exemplar Exercise Problems XXVII — task. Mathematics CBSE, Class 9.

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Multiply \(x^2 + 4y^2 + z^2 + 2xy + xz – 2yz\) by \((–z + x – 2y)\).

Ans:

\(x^3 – 3y^3 – z^3 – 6xyz\)
\(x^3 – y^3 – z^3 – xyz\)
\(x^3 + 3y^3 +2 z^3 – 3xyz\)
\(x^3 + y^3 – z^3 + 2xyz\)

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