Question

Let f(x) = x – 2 and g(x) = x^2 – 7x – 9. Find f(g(–1)).

21

3

–3

–21

Please explain, I don't really understand what to do.

Answer 1

first find center function vaule which is g(-1)
g(-1)=\[(-1)^{2}-7(-1)-9\]
=1+7-9
g(-1)=-1

so the center value is -1 we can now replace g(-1) to -1
the solution now becomes f(-1)

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

the answer is -3