If f (x) = x 3 + 4x 2 + λx + 1 is a strictly decreasing function of x in the largest…
Mathematics · JEE Main · NTA Exams — Limit, Continuity and Differentiability
If f (x) = x3 + 4x2 + λx + 1 is a strictly decreasing function of x in the largest possible interval \(\left[-2,-\frac{2}{3}\right]\) then
- λ = 4
- λ = 2
- λ = –1
- λ has no real value
Answer
(A) λ = 4
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