Question
Download Solution PDFনীচের কোন বিবৃতিটি সঠিক?
I.
II.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFপ্রদত্ত:
k + 1/k = 12
অনুসৃত সূত্র:
(x + 1/x)2 = (x2 + 1/x2) + 2
(a - b)(a + b) = a2 - b2
গণনা:
প্রথম বিবৃতিটি ধরি
k + 1/k = 12
ব্যবহার করে
(x + 1/x)2 = (x2 + 1/x2) + 2
(k2 + 1/k2) = 144 - 2
(k2 + 1/k2) = =142
অতএব, প্রথম বিবৃতিটি সঠিক
দ্বিতীয় বিবৃতিটি ধরি
(a - b)(a + b) = a2 - b2 ব্যবহার করে
সুতরাং, দ্বিতীয় বিবৃতিটি সঠিক নয়।
অতএব, কেবল বিবৃতি I সঠিক।
∴ বিকল্প 1 সঠিক উত্তর।
Mistake Points
অনুগ্রহ করে লক্ষ্য করুন,
(K4)2 = K4 * 2 = K8
সুতরাং, বিবৃতি 2 সঠিক নয়।
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