Answer:
b
Step-by-step explanation:
Looks like the given function is

Recall that for |<em>x</em>| < 1, we have

We want the series to be centered around
, so first we rearrange <em>f(x)</em> :

Then

which converges for |(<em>x</em> - 4)/5| < 1, or -1 < <em>x</em> < 9.
Answer:
9
Step-by-step explanation: