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JEE Mains · Maths · STD 12 - 7.2 definite integral

माना वास्तविक गुणांकों का एक द्विघातीय बहुपद \(P ( x )= x ^{2}+ bx + c\) इस प्रकार है कि \(\int \limits_{0}^{1} P ( x ) dx =1\) है तथा \(P ( x )\) को \(( x -2)\) से विभाजित करने पर शेषफल 5 आता है। तो \(9( b + c )\) का मान बराबर है

  1. A \(9\)
  2. B \(15\)
  3. C \(7\)
  4. D \(11\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(7\)

Step-by-step Solution

Detailed explanation

\(\int_{0}^{1}\left( x ^{2}+ bx + c \right) dx =1\) \(\frac{1}{3}+\frac{b}{2}+c=1 \quad \Rightarrow \quad \frac{b}{2}+c=\frac{2}{3}\) \(3 b+6 c=4.......(1)\) \(P (2)=5\) \(4+2 b+c=5\) \(2 b + c =1.......(2)\) From \((1)\) And \((2)\) \(b =\frac{2}{9}\) And \(c =\frac{5}{9}\)…
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