Question: Only for very special additive functions is it true that f ( a + b ) = f ( a ) + f ( b

  1. Only for very special "additive" functions is it true that f (a + b) = f (a) + f (b) for all a and b. Determine whether f (2 + 1) = f (2) + f (1) for the following functions:
  2. (a) f(x)=2x2 (b) f(x)=3x (c) f(x)=x

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