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Question

Which of the following functions is non – injective?


Your Answer
A
f(x)=|x+1|,xϵ[1,)
Correct Answer
B
g(x)=x+1x,xϵ(0,)
Your Answer
C
h(x)=x2+4x5,xϵ(1,)
Your Answer
D
k(x)=ex,x ϵ[0, )

Solution

The correct option is A g(x)=x+1x,xϵ(0,)
Clearly, (a) Increasing.
(b) Neither increasing nor decreasing
(c) Increasing
(d) Decreasing

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