If you are receiving a message saying "The character you entered is not required in this answer. Please try again!", please first review the answer you're attempting to input.
This message means the character, symbol, or expression you've attempted to enter for the answer is not required. For example, you may be entering a variable or a radical symbol when one isn't needed.
If you are unsure of how to enter your answer, you can go to Tutor in Practice mode for that lesson and review the question to see what answer format is required.
