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সূত্রের সাহায্যে ঘন নির্ণয় কর: $7m^2-2n$

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প্রদত্ত রাশির ঘন $\left(7m^2-2n\right)^3$

$=\left(7m^2-2n\right)^3$

$=\left(7m^2\right)^3$$-3\cdot\left(7m^2\right)^2\cdot2n$$+3\cdot7m^2\cdot\left(2n\right)^2$$-\left(2n\right)^3$

$=343m^6$$-6n\cdot49m^4$$+21m^2\cdot4n^2$$-8n^3$

$=343m^6-294m^4n$$+84m^2n^2$$-8n^3$ [Answer]

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