What is this and how do I solve it? Domain and Range of functions.

zoriez

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Oct 10, 2015
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I was on Khan Academy, working through domain stuff and I don't really understand what I'm looking at on the top. I see that it's a function, however why is there a 6 at the bottom? What are the "if x =/= 5 and x = 5" things on the side? Thank you.
 

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The image is way too small for me to read. Please reply with the typed-out text of the discussion (or whatever) in question. Thank you! ;)
 
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