Expression 5: "i" left parenthesis, "x" , right parenthesis equals "a" left parenthesis, "x" minus "x" Subscript, 1 , Baseline , right parenthesis left parenthesis, "x" minus "x" Subscript, 2 , Baseline , right parenthesis left parenthesis, "x" minus "x" Subscript, 3 , Baseline , right parenthesis left parenthesis, "x" minus "x" Subscript, 4 , Baseline , right parenthesis left parenthesis, "x" minus "x" Subscript, 5 , Baseline , right parenthesisix=ax−x1x−x2x−x3x−x4x−x5