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সূত্রের সাহায্যে বর্গ নির্ণয় কর: $4y-5x$

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সূত্রের সাহায্যে বর্গ বরা হলো :

$4y-5x$ এর বর্গ

$\left(4y-5x\right)^2$

$\left(4y\right)^2-2\cdot4y\cdot5x+\left(5x\right)^2$

$16y^2-40xy+25x^2$ [Answer]

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