The expression π(r-3)^2 represents the area covered by the hour hand on a clock

First, you have to square (r-3), which is (r-3)(r-3). You would then FOIL to get r^2-6r+9. You can't forget about pi, though; your actual expression at this point is pi(r^2-6r+9). You can then distribute pi to each term to get a final answer of pi(r^2)-6(pi)r+9(pi). (I had to use parenthesis there to make it look less confusing, as I don't have a pi symbol on my keyboard.)

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