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

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Simplify

$(2x – 5y)^3 – (2x + 5y)^3$ .

Ans:

$250xy^3 – 120x^2$
$50y^3 +20x^2y$
$50xy^3 +30x^2y$
$– 250y^3 – 120x^2y$

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