Answer:
-13
Explanation:
You want the value of f(g(-1)) given f(x) = x-1 and g(x) = x²+4x-9.
Function evaluation
A function is evaluated by putting the argument where the variable is and doing the arithmetic.
g(-1) = (-1)² +4(-1) -9 = 1 -4 -9 = -12
f(g(-1)) = f(-12) = (-12) -1 = -13
The composition value is f(g(-1)) = -13.