Published by:
CGP EDU Academic Team
Published on: August 13, 2026
Let f(x) = 2x 2 -x-l and 
. Then, the value of 
is equal to ________.
Text Solution
Verified by ExpertsThe correct answer is:
10620
(10620)
f(x) = 2x 2 - x - 1
|f(x)| 
800
2n 2 -n-801 
0
n = {-19,-18-17 ? .......0,1,2,......,20}
= 2[19 2 +18 2 +.....+ l 2 +l 2 +2 2 +.... + 19 2 +20 2 l
= 4[l 2 +2 2 +.....+ 19 2 J + 2[20 2 ]-20-40
=10620
──────────────────────────────────────────────────────────────────────────────────────────
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems
If where n is an even integer, is an arithmetic progression with common difference 1, and , then …
If , then the remainder when K is divided by 6 is
The sum 1 + 2 . 3 +3 . 3 2 +.....+ 10 . 3 9 is equal to
If and , then is equal to :
If , where a, b, c are in A.P. and |a| < 1, |b| < 1, |c| < 1, abc 0, then
Let then 4S is equal to