समीकरण ax2 + x + b = 0 चे मूळ समान असल्यास

  1. b2 = 4a
  2. b2 < 4a
  3. b2 > 4a
  4. ab = 1/4

Answer (Detailed Solution Below)

Option 4 : ab = 1/4
Free
RRB Group D Full Test 1
100 Qs. 100 Marks 90 Mins

Detailed Solution

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दिलेल्याप्रमाणे:

दिलेले समीकरण ax2 + x + b = 0 आहे

वापरलेली संकल्पना:

चतुर्भुज समीकरणाचे सामान्य स्वरूप ax2 + x + b = 0 आहे

मूळांकरिता अट,

समान आणि वास्तविक मुळांसाठी, b2 – 4ac = 0 

असमान आणि वास्तविक मुळांसाठी, b2 – 4ac > 0

काल्पनिक मुळांसाठी, b2 – 4ac

गणना:

समान आणि वास्तविक मुळांसाठी, b2 – 4ac = 0 

⇒ b2 = 4ac

चतुर्भुज समीकरणाच्या सामान्य स्वरूपाशी तुलना केल्यानंतर आपल्याला मिळेल

b = 1, a = a आणि c = b

नंतर, b2 = 4ac

⇒ 1 = 4ab

⇒ ab = 1/4

∴ योग्य संबंध ab = 1/4 आहे

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