For the given function and interval, determine if we're allowed to use the Mean Value Theorem for the function on that interval. If so, what does the Mean Value Theorem let us conclude?
Answer
\item Since f is continuous on [-1,1] and differentiable on (-1,1), yes, we are allowed to use the Mean Value Theorem. The Mean Value Theorem says there will be some c in (-1,1) where
$$f'(c) = \frac{f(1)-f(-1)}{1-(-1)} = \frac{1-(-1)}{1-(-1)} = 1.$$