Which functions are invertible? Select each correct answer.

enter image source here

1 Answer
Daniel L.
Dec 10, 2017

They are A and D. See explanation.

Explanation:

A function is invertible if and only if it takes each value only once. This is true for A and D.

For other functions this statement is false.

For example function in C takes 0 for x_1=-4 and x_2=4.

Function B also has 2 zeros. They are 0 and 3.

Related questions
Impact of this question
7835 views around the world
You can reuse this answer
Creative Commons License