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বর্গ সূত্র ব্যবহার করে, সরল কর: $(7p+3q-5r)^2$$-2(7p+3q-5r)(8p-4q-5r)$$+(8p-4q-5r)^2$

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বর্গের সাহায্যে সরল করা হলো:

$(7p+3q-5r)^2$$-2(7p+3q-5r)(8p-4q-5r)$$+(8p-4q-5r)^2$

ধরি,
$(7p+3q-5r)=a$ এবং $(8p-4q-5r)=b$

তাহলে প্রদত্ত রাশি দাঁড়ায়,

$a^2-2ab+b^2$

$=(a-b)^2$

$=\left\{(7p+3q-5r)-(8p-4q-5r)\right\}^2$
[ a ও b এর মান বসিয়ে ]

$=\left(7p+3q-5r-8p+4q+5r\right)^2$

$=\left(7q-p\right)^2$

$=(7q)^2-2\cdot7q\cdot p+(p)^2$

$=49q^2-14qp+p^2$ [Answer]

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