Question

Let $Z$ be the set of integers and $f:Z\to Z$ is a bijective function then

• A. $f(x)=x^2+4$
• B. $f(x)=2x+3$
• C. $f(x)=x$
• D. $f(x)=x^3+3$

Answer 1

Answer: (C)

f(x) = x is identity function which is bijective