What is the correct function of this vertex? h(x)=(x+2)-1

Try this website called wolfram Alpha. It's an easy-to-use but advanced calculator. It gives you lots of information for every query. Here's a direct link to the answer to your question on Wolfram Alpha: http://www.wolframalpha.com/input/?i=h(x)%3D(x%2B2)-1. Hope this helps!

70% hope this helps:)