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JEE Mains · Maths · STD 12 - 1. relation and function

माना \(f(x)=2 x^2-x-1\) तथा \(S=\{n \in Z :|f(n)| \leq 800\} \quad\) हैं। तब \(\sum \limits_{n \in S} f(n)\) का मान है \(............\)

  1. A \(10620\)
  2. B \(10630\)
  3. C \(10640\)
  4. D \(10650\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(10620\)

Step-by-step Solution

Detailed explanation

\(f ( x )=2 x ^{2}- x -1\) \(| f ( x )| \leq 800\) \(2 n ^{2}- n -801 \leq 0\) \(n^{2}-\frac{1}{2} n-\frac{801}{2} \leq 0\) \(\left(n-\frac{1}{4}\right)^{2}-\frac{801}{2}-\frac{1}{16} \leq 0\) \(\left(n-\frac{1}{4}\right)^{2}-\frac{6409}{16} \leq 0\)…
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