व्यंजक  2x3 + x2 – 2x – 1 किसके द्वारा विभाजित है?

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UPPSC Civil Service 2019 Official Paper 2
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  1. 2x + 3
  2. 2x + 1
  3. 2x - 3
  4. 2x – 1

Answer (Detailed Solution Below)

Option 2 : 2x + 1
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Detailed Solution

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2x3 + x2 – 2x – 1

⇒ x2(2x + 1) – (2x + 1)

⇒ (2x + 1) (x2 – 1)

∴ व्यंजक 2x3 + x2 – 2x – 1, (2x + 1) से विभाजित है 
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