यदि x − \(\rm\frac{1}{x}\) = 3 है, तो x3 − \(\rm\frac{1}{x^3}\) का मान ज्ञात कीजिए। 

This question was previously asked in
Bihar STET Paper I: Mathematics (Held In 2019 - Shift 1)
View all Bihar STET Papers >
  1. 36
  2. 63
  3. 99
  4. इनमें से कोई नहीं

Answer (Detailed Solution Below)

Option 1 : 36
Free
Bihar STET Paper 1 Mathematics Full Test 1
13.9 K Users
150 Questions 150 Marks 150 Mins

Detailed Solution

Download Solution PDF

दिया गया है:

x - 1/x = 3

प्रयुक्त अवधारणा:

a3 - b3 = (a - b)3 + 3ab(a - b)

गणना:

x3 - 1/x3 = (x - 1/x)3 + 3 × x × 1/x × (x - 1/x)

⇒ (x - 1/x)3 + 3(x - 1/x)

⇒ (3)3 + 3 × (3)

⇒ 27 + 9 = 36

∴ x3 - 1/x3 का मान 36 है।

Alternate Methodयदि x - 1/x = a है, तब x3 - 1/x3 = a3 + 3a

यहाँ a = 3

x - 1/x3 = 33 + 3 × 3

= 27 + 9

= 36

Latest Bihar STET Updates

Last updated on Jan 29, 2025

-> The Bihar STET 2025 Notification will be released soon.

->  The written exam will consist of  Paper-I and Paper-II  of 150 marks each. 

-> The candidates should go through the Bihar STET selection process to have an idea of the selection procedure in detail.

-> For revision and practice for the exam, solve Bihar STET Previous Year Papers.

Get Free Access Now
Hot Links: teen patti casino download teen patti 100 bonus all teen patti game teen patti joy official