Hey everyone. I posted something similar a while back, but I just still seem to be having major problems finding the "K" while doing the trapezoid rule error bound approximation. I understand that I find the second derivative of the equation, find at what point on the interval (absolute value of course) it attains its max value, and then plug in that X into the second derivative equation to give me my K. For whatever reason though I just always do it wrong. For example, could someone walk me through this problem? Thank you!

Sqrt[ 1 + x^4 ] from 0 to 1. Approximate the error using n=10 sub intervals and the Trapezoid Rule for error bounds.