Question

I have no idea how to solve this..
Let g and f be two functions defined by
g(x)=x-8
f(x)=x^2-25
for any real number x.
Find all values of x that are NOT in the domain of the function g/f. If there is more than one value, separate them with commas.

Answer 1

g/f means g or f?

Answer 2

or g divided by f

Answer 3

now this g/f thing will be undefined at x=8, as then the value of denominator will be 0, and the function will shoot to infinity!! so x=8 isn't in the domain of g/f.