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

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Simplify

$(2x – 5y)^3 – (2x + 5y)^3$ .

Ans:

$– 250y^3 – 120x^2y$
$250y^3 – 120x^2y$
$250y^3 + 120x^2y$
$– 250y^3 + 120x^2y$

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