Describe the three errors.

Answer:

The three errors are: 1. The student failed to switch both instances of 'x' with 'y' when finding the inverse. 2. Only the principal square root was used instead of both positive and negative roots (plusminus sign). 3. The domain restriction is incorrect; for the radicand to be nonnegative, the inequality sign for x should be properly defined as x > something rather than the incorrect direction provided.