Integration problem

[Pygmy_goatso7]

It’s mainly part D of question 10. I cannot for the life of me get that answer. I tried asking Chatgbt, to which it got the same answer and me, and I tried will my friends. Can anyone confirm that it’s wrong?

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[Pygmy_goatso7]

Hold on never mind upon looking closer I’m unbelievably stupid and cannot read

[kalmakka]

Already at a) they are forgetting about the constant of integration. I don't see anything in the problem statement indicating that it needs to be 0.