3x2 – ax + 6 = ax2 + 2x + 2

 ന് ഒരേയൊരു (ആവർത്തിച്ചുള്ള) പരിഹാരം മാത്രമേ ഉള്ളൂ എങ്കിൽ, a യുടെ പോസിറ്റീവ് ഇന്റഗ്രൽ സൊല്യൂഷൻ ഇതാണ്:

This question was previously asked in
RRB ALP Previous Paper 7 (Held On: 13 Aug 2018 Shift 2)
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  1. 3
  2. 2
  3. 4
  4. 5

Answer (Detailed Solution Below)

Option 2 : 2
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Detailed Solution

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നൽകിയിരിക്കുന്നത്:

3x2 – ax + 6 = ax2 + 2x + 2

⇒ 3x2 – ax2 – ax – 2x + 6 – 2 = 0

⇒ (3 – a)x2 – (a + 2)x + 4 = 0

ഉപയോഗിച്ച ആശയം:

ഒരു രണ്ടാംകൃതി സമവാക്യത്തിന്  (ax+ bx + c=0) തുല്യ മൂലങ്ങളുണ്ടെങ്കിൽ, ഡിസ്ക്രിമിനന്റ് പൂജ്യമായിരിക്കണം അതായത്, b2 – 4ac = 0

കണക്കുകൂട്ടൽ:

⇒ D = B2 – 4AC = 0

⇒ (a + 2)2 – 4(3 – a)4 = 0

⇒ a2 + 4a + 4 – 48 + 16a = 0

⇒ a2 + 20a – 44 = 0

⇒ a2 + 22a – 2a – 44 = 0

⇒ a(a + 22) – 2(a + 22) = 0

⇒ a = 2, -22

∴ a യുടെ പോസിറ്റീവ് ഇന്റഗ്രൽ സൊല്യൂഷൻ​ = 2 ആണ്.

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