Answer :
Given:
[tex]\lbrace(1,2)(5,8)(9,-4)\rbrace[/tex]If the function represent in from:
[tex]\begin{gathered} \lbrace(a,b)(c,d)\rbrace \\ \text{Range}=\lbrace b,d\rbrace \\ \text{Domain}=\lbrace a,c\rbrace \end{gathered}[/tex]so range is:
[tex]\lbrace-4,2,8\rbrace[/tex]