-7+15. this is what i think it is.
Answer:
W= 2
Step-by-step explanation:
F(f-1x) will be equal to x
take a simple example
f(x) = 2x
so x = f(x) / 2
f-1(x) = x/2
f(f-1x) = 2 ( x/2) = 2 * x/2 = x
X = 4, -2 that should be the roots(zeros) of the function.