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Homework Help: Find Direct/Inverse Images

  1. Aug 28, 2010 #1
    1. The problem statement, all variables and given/known data

    The problem is attached and my attempt for direct image is also attached.
    I seek help in inverse image.

    2. Relevant equations

    3. The attempt at a solution

    Attached Files:

  2. jcsd
  3. Aug 28, 2010 #2
    You did part (a) correctly!

    Part (b):
    If [tex] h = g \circ f, [/tex] then [tex] h^{-1} = f^{-1} \circ g^{-1}. [/tex]
    Look at the boundaries of G. They will give you the boundaries of its inverse image. This isn't ALWAYS the case, but our function here is pretty simple so it will work out well.
  4. Aug 28, 2010 #3
    Based on your suggestions...

    Attached Files:

  5. Aug 28, 2010 #4
    mhmm! and a nice self-assuring way to check that you "almost definitely" got it right is the fact that [tex] f(\{x : -2 \le x \le 0\}) = G. [/tex] I say "almost definitely" because it could happen that you luck out and it works even though your answer's wrong...but let's not worry about that haha. you got it right!
  6. Aug 28, 2010 #5
    It turns out, I am not too dumb, yay!! (Thank you for your patience, Raskolnikov.)
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