Answer
One-to-one
Work Step by Step
See the graph of $q(x)$.
The function is increasing on $\mathbb{R}$.
Then, $q$ is one-to-one function.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.