I'm studiyng for my exam of scientific computing, specifically to the subject of interpolation techniques, I'm stuck with this problem:
How many equally spaced nodes must be taken to interpolate the function $f(x) = \exp(x)$ on the interval $[-1,1]$, so that the interpolation error is $0.5 * 10^{-4}$?
I have no idea how to start or what should I do in the exercise. Any help?