Posted by Sofia on .
Consider the function f(x)=(5^x−1)/x.
A) Fill in the table values for f(x):
x= 0.1, 0.01, 0.001, 0.0001, 0.0001, 0.001, 0.01, 0.1
f(x)= 1.4866, 1.5866, 1.6081, 1.6093, 1.6096, 1.6107, 1.6225, 1.7462
B) Based on the table values, what would you expect the limit of f(x) as x approaches 0 to be?
lim (5^x1)/x= 1.60
x>0
C) Graph the function to see if it is consistent with your answers to parts (a) and (b). By graphing, find an interval for x near zero such that the difference between your conjectured limit and the value of the function is less than 0.01. In other words, find a window of height 0.02 such that the graph exits the sides of the window and not the top or bottom. What is the window?
_____ <_ x <_ ________
______ <_ y <_ _________
So far, everything I've done is correct for a and b. The online program we use for turning in homework allows us to preview the correctness of our answers. My issue is finding part C. When I use 0.02 and 0.02 for the xrange, I cannot find y. I've tried the epsilondelta scheme, but I'm having trouble understanding that. I'm in a pinch on this homework question.

Calculus 
Reiny,
I assume you used a calculator to find f(x) for the given values of x
Why are you having difficulty finding f(.02) and f(.02) ?
my calculator gives me
f(.02) = 1.5836..
f(.2) = 1.6356..
so
.02 ≤ x ≤ .02
1.5836 ≤ y ≤ 1.6356