Question

Question #658c3

Answer 1

Start inside the expression by finding `g` "of" -1 or `g(-1)`

Substitute `-1` for `x` in `g(x)`.
`g(-1)= (-1)^2-7(-1)-9 = -1`

Now look at the "outside" part of the expression`f` "of" `g(-1)`.

We just found `g(-1)= -1`.
BTW, that's a coincidence that both `x=-1` and `g(-1)= -1`.

Substitute `g(-1)` in for `x` in `f(x)=x-2`.

`f(g(-1)) = f(-1)= -1-2=-3`

I'm not sure why you've listed the numbers -21, -3, 3, and 21, but if you have to find`f(g(x))` for these values, just follow the same process.