Expression 4: 2 "x" squared minus 8 ninths "x"2x2−89x
4
Expression 5: left parenthesis, 2 "x" squared minus 8 ninths "x" minus "y" , right parenthesis left parenthesis, "x" cubed minus "y" , right parenthesis less than 0 left brace, 0 less than or equal to "x" less than or equal to 4 thirds , right brace2x2−89x−yx3−y<00≤x≤43
5
Expression 6: left parenthesis, 2 "x" squared minus "a" "x" minus "y" , right parenthesis left parenthesis, "x" cubed minus "y" , right parenthesis less than 0 left brace, 1 minus StartRoot, 1 minus "a" , EndRoot less than or equal to "x" less than or equal to 1 plus StartRoot, 1 minus "a" , EndRoot , right brace2x2−ax−yx3−y<01−1−a≤x≤1+1−a