Soon after getting the constants A and B it's rather simple to compute the integral ##int frac dx x^2 + 9 ## as it can now be created as two more simple integrals. I tried but I are unable to see how ##A,B## are constants? This is supported by a https://gabletoppak.com/the-growing-threat-of-marine-pollution-and-how-gabletop-cartons-offer-a-solution/