যদি  5x3 + 5x2 – 6x + 9 কে (x + 3) দ্বারা ভাগ করা হয়, তাহলে ভাগশেষ কত হবে?

This question was previously asked in
CDS Maths Previous Paper 4 (Held On: 19 Nov 2017)
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  1. 135
  2. -135
  3. -63
  4. 63

Answer (Detailed Solution Below)

Option 3 : -63
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Detailed Solution

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অনুসৃত ধারণা:

ভাগশেষ উপপাদ্য:

যদি একটি বহুপদী p(x) কে (x−a) দ্বারা ভাগ করা হয়, তাহলে ভাগশেষ a হয়

p(a) দ্বারা প্রদত্ত ধ্রুবক।

গণনা:

ধরুন p(x) = 5x3 + 5x2 – 6x + 9

যেহেতু, (x + 3) দ্বারা p(x)-কে ভাগ করা হলে, ভাগশেষ হবে p(-3)

⇒ p(-3) = 5 × (-3)3 + 5 × (-3)2 – 6 × (-3) + 9

⇒ p(-3) = -63

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