Work Step by Step
Recall, the only numbers whose reciprocal is itself are $1$ and $-1$. Note, zero does not count, for its reciprocal has zero in the denominator and is thus undefined.
You can help us out by revising, improving and updating this answer.Update this answer
After 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.