Out of curiosity, what website was it?

There is an addition term in the first parenthesis, so we should expect at least two terms in our final answer.

Your problem was that you treated that first addition sign as a multiplication sign and added all of the exponents together.

Either the answer key or your representation of the problem is wrong.

You only add the exponents when like bases aremultipliedtogether. When they are added, you cannot do much for simplification purposes.