Expression 2: "g" left parenthesis, "x" , "n" , right parenthesis equals Start sum from "k" equals 0 to "n" , end sum, left parenthesis, negative "x" squared , right parenthesis Superscript, "k" , Baselinegx,n=n∑k=0−x2k
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Expression 3: "g" left parenthesis, "x" , "n" , right parenthesis Has graph. To audio trace, press ALT+T.gx,n