I am trying to teach myself calculus. This is a problem from my book. I did it multiple times and finally got it right according to the answer in the book: 12x^5 + 25x^4 - 9x^2 - 2x - 2

The problem is, I checked it on chatGPT and it gives 10x^5 + 20x^4 + 4x^3 - 6x^2 - 2x - 2

Then I checked it on Gemini and it gives 12x^5 + 25x^4 - 11x^2 - 2

So I am going nuts. Which is correct? Please, please check my work. Thank you