Just after discovering the constants A and B It can be relatively straightforward to compute the integral ##int frac dx x^2 + 9 ## as it might now be penned as two simpler integrals. I tried but I can not see how ##A,B## are constants? Even though the thought from https://gabletoppak.com/what-makes-gabletop-pak-cartons-a-better-choice-than-plastic-bottles/