Answer
The graph should have been shifted right one, not left one like the student did.
Work Step by Step
There are two ways to graph a function. First of all, we could recognize, based on the form that the equation is in, what the shape and location of the graph will be. However, it can often times be easier to plot points in order to see the shape of the graph, allowing us to create the overall graph.
The graph is attached.
