Question

Identify the roots of the function g(x) = x^2 - 8x + 16

Answer 1

A function is not this but for example g times x is

Answer 2

A function doesn't have roots until you give it a numerical value.
Then, the roots are the values of the variable that give the function
that value.

For example, if you said that  g(x) = 0,
then the roots would both be  x = 4 .

But if you said that  g(x)=16, then
the roots would be  x=0  and  x=8 .