বহুপদ রাশি 6x2 + 3x2 – 5x + 1-কে শূন্যের সমান করে প্রাপ্ত বীজগুলির অন্যোন্যকের যোগফল কত?

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RRC Group D Previous Paper 10 (Held On: 28 Sep 2018 Shift 1)
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  2. 3
  3. 4
  4. 5

Answer (Detailed Solution Below)

Option 4 : 5
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⇒ 6x2 + 3x2 – 5x + 1

⇒ 9x2 – 5x + 1

ধরি, a এবং b সমীকরণের দুটি মূল

আমরা জানি যে,

মূলগুলির যোগফল (α + β) = (-b)/a = 5/9

মূলগুলির গুণফল (αβ) = c/a = 1/9

প্রশ্ন অনুযায়ী

⇒ 1/α + 1/β

⇒ (α + β)/αβ

⇒ [5/9] / [1/9] = 5
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