You can now practice modifying a Mathematica command and, at the same time, get a closer look at the graph.
Follow these steps to change the domain of x in the plot command below:
· Carefully place the cursor in front of the -7;
· Press and drag the mouse across the -7,7 (it will be shaded grey);
· Type -4,4 (the -7,7 will be replaced).
Now execute the modified plot command. (If the command does not execute, it's always a good idea to check for typographical errors. If there are no errors and the graph still does not plot, ask for help.)
Plot[y, {x,-7,7}, PlotRange -> All]
You will now see a more detailed graph of y where it crosses the x-axis.