Increasing Cubic Function Values (Jee Mains) | ExamDuo
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Application of Derivates
Medium
Increasing Cubic Function Values
Let
λ
*
be the largest value of
λ
for which the function
f
λ
(
x
)
=
4
λ
x
3
−
36
λ
x
2
+
36
x
+
48
is increasing for all
x
∈
R
. Then
f
λ
*
(
1
)
+
f
λ
*
(
−
1
)
is equal to :
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SELECT ONE OPTION
A
36
B
48
C
64
D
72
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