Question
Download Solution PDFযদি x − \(\rm\frac{1}{x}\) = 3 হয়, তাহলে x3 − \(\rm\frac{1}{x^3}\) এর মান কত হবে?
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Bihar STET Paper I: Mathematics (Held In 2019 - Shift 1)
Answer (Detailed Solution Below)
Option 1 : 36
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Bihar STET Paper 1 Mathematics Full Test 1
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Detailed Solution
Download Solution PDFপ্রদত্ত:
x - 1/x = 3
অনুসৃত ধারণা:
a3 - b3 = (a - b)3 + 3ab(a - b)
গণনা:
প্রদত্ত পরিচয় প্রয়োগ করে:
⇒ x3 - (1/x)3 = (x - 1/x)3 + 3(x × 1/x)(x - 1/x)
⇒ x3 - (1/x)3 = (3)3 + 3(1)(3)
⇒ x3 - (1/x)3 = 27 + 9
⇒ x3 - (1/x)3 = 36
∴ x3 - (1/x)3 এর মান হল 36
Last updated on Jan 29, 2025
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