make a table of values for x and y
(f(x) is really y,
f(x) = x^2 is the same as y = x^2
graph these points, they should give you a good outline of the curve.
for something like
f(x) = 3x - 3
then f(4) = 3(4)-3 = 9
wherever I saw an x, I subbed in a 4
you can now do the rest
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