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This question was previously asked in
CDS Elementary Mathematics 3 Sep 2023 Official Paper
Answer (Detailed Solution Below)
Option 3 :
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Detailed Solution
Download Solution PDFপ্রদত্ত:
অনুসৃত সূত্র:
1. (a + b)2 = a2 + b2 + 2ab
2. (a - b)2 = a2 + b2 - 2ab
3. (a2 - b2) = (a - b)(a + b)
গণনা:
⇒
অভিন্নতা (1) এবং (2) ব্যবহার করে
⇒
অভিন্নতা (3) ব্যবহার করে
⇒
⇒
⇒
∴ সঠিক উত্তর হল
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