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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