140 CHAPTER 3 Functions tab B 49. Let f(x) = (x - a)/(x + a). (a) Find f(a), f(2a), and f(3a). Is it true that f(3a) = f(a) + f(2a)? (b) Show that f(5a) = 2f(2a). ང @ 2 Q W #3 $ 4 005 % E R T 66 29 & 7 8 00 YU 61 0 .. delet 11

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