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

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

Ans:

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

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