If f(x)=x^{3}+3 x^{2}+(4-k) x+b is an injective function \\forall x \\in R, then maximum integral value of k is ________

JEE Advanced 2021 Full Test 5 Paper 2

SECTION – B (Single Digit Integer Type)
This section contains 06 questions. The answer to each question is a Single Digit integer ranging from 0 to 9, both inclusive.

Question : 44 of 54

Marks: +1, -0

If f(x)=x3+3x2+(4−k)x+b is an injective function ∀x∈R, then maximum integral value of k is ________

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