Published by:
CGP EDU Academic Team
Published on: August 14, 2026
If f (x) = x 3 + 4x 2 + 
x + 1 is a monotonically decreasing function of x in the largest possible interval 
, then
A
B
C
D
has no real value
Text Solution
Verified by ExpertsThe correct answer is:
A
= 4
Here, f'(x) 
0
Then, situations for f' (x) is as follow :
Given that f (x) decreases in the largest possible interval
then f (x) = 0 must have roots -2 and 
Product of roots is 
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