यदि f(x) = 9x - 8√x है और g(x) = f(x) - 1 है, तो निम्नलिखित में से कौन सा सही है?

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NDA-II 2024 (Maths) Official Paper (Held On: 01 Sept, 2024)
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  1. g(x) = 0 का कोई वास्तविक मूल नहीं है
  2. g(x) = 0 का केवल एक वास्तविक मूल है जो एक पूर्णांक है
  3. g(x) = 0 के दो वास्तविक मूल हैं जो पूर्णांक हैं
  4. g(x) = 0 का केवल एक वास्तविक मूल है जो पूर्णांक नहीं है

Answer (Detailed Solution Below)

Option 2 : g(x) = 0 का केवल एक वास्तविक मूल है जो एक पूर्णांक है
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NDA 01/2025: English Subject Test
30 Qs. 120 Marks 30 Mins

Detailed Solution

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व्याख्या:

दिया गया है:

f(x) = 9x - 8√x

g(x) = f(x) - 1

माना x = t2

⇒ g(t2 ) = 9t2 - 8t - 1 = 0

⇒ t =

⇒ x = 1 , 1/81

g(x) = 0 का केवल एक वास्तविक मूल है जो एक पूर्णांक है।

∴ विकल्प (b) सही है।

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