For the function f(x)= 3x-8 / x+5, find:

a. f(0)
= -8/5

b. f(-1)
= -11/4

Correct?

correct if you function is

f(x)= (3x-8)/(x+5)

if the function is the way you typed it, then f(0) is undefined, and
f(-1) = 10