1 Answers
এখানে ধরি, 5x+7y+3z=a
এবং 7x-7y-3z=b
তাহলে প্রদত্ত রাশি=a^2+2ba+b^2
=a^2+2ab+b^2
=(a+b)^2
={(5x+7y+3z)+(7x-7y-3z)^2}^2 [ এখানে a ও b এর মান বসিয়ে ]
=(5x+7y+3z+7x-7y-3z)^2
=(12x)^2
=144x^2 (Ans)
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