Is there a picture or something that could at least tell us what is your question
In the real world you are not going to have a calculator on you 24/7. Nor will you have a pencil or paper to do longhand. You need to know how to accurately estimate your answers in order to be successful.
You can solve this by algebraically as well as graphically. When I tried both ways I got:
solution is x= -2<span />
