Question

Which one of the following is a bijective function on the set of real numbers?

• A. $2x-5$
• B. $|x|$
• C. $x^2$
• D. $x^2+1$
• E. $x^4-x^2+1$

Answer 1

Answer: (A)

$\because$ In the given options only $2x-5$ is one-one and onto, therefore it is bijective.