1. The problem statement.

I have to estimate the absolute value of the remainder, R_{2,x}_{0=4}(x), of the function f(x)=1/x^{1/2}on the interval ] 3.8 , 4.2 [ when x_{0}= 4 and n = 2.

2. Relevant equations

I've used this equation :

3. The attempt at a solution

I hope that someone will be able to look at this and help me because I think the result might be wrong, the absolute value of the remainder seems too small !