Plotting can be a little tricky. It doesn't do much good unless you plot where something interesting happens.
For example, your f(x) = x^2 might be quite uninteresting for values of 'x' between 20 and 30.
In the world of text books, you are a little bit off the hook. Text books tend to pick things that are interesting not too far from x = 0.
For these two, sure enough, right around zero is probably a good place to start. Just pick some values. It doesn't matter very much which values. Start with x = 0. Then try x = 1 and x = -1. Did you notice anything interesting about those last two? If so, what caused it?
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