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Find function f(x)?

  1. Nov 27, 2007 #1
    f(xy) +f(x-y)+f(x+y+1) = xy+(x-y)+(x+y+1)

    find the function f(x) that defines the above equation? can you do it? thanks
  2. jcsd
  3. Nov 27, 2007 #2
    f(x) = x, 1-1 relationship here

    f(xy) = xy
    f(x-y) = x-y
    f(x+y+1) = x+y+1
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