can someone please help me in finding the range

Answer:
[tex]\{-20, -2 ,13\}[/tex]
Step-by-step explanation:
The range of a function is the set of its possible output values
[tex]f(x) = 3x-8\\\\f(-4) = 3(-4) -8 = -12 -8 = -20\\\\f(2) = 3(2) -8 =6-8 = -2\\ \\f(7) = 3(7) -8 = 21 -8 = 13\\\\\text{Range} = \{-20, -2 ,13\}[/tex]