This is a sample from the AP calculus exam. "If the function e^(-3x)/27 is approximated using the Maclaurin polynomial 1/27-x/9+x^2/6, what is the Lagrange error bound for the maximum error on |x|<0.5?" The textbook I'm using has no definition for Lagrange error bound, so I don't know what is being asked or how to find it.