Calculus ll, I would really appreciate some help checking how I did please

[tatibarrera231]

I've been trying to solve this calculus ll exercise and I have been having problems, I wanted to know if you can examine it and tell me what you think, Is it wrong? Is it right?, What am I doing wrong?, How you would do it?, anything helps. Hope you can help and thank you very much in advance

Here is part 1.A of my question:

Here is what I did:

Here is part 1.B of my question:

Here is what I did:

Here is part 1.C of my question:

Here is what I did:

Please tell me how I did, and I just wanted to say thank you for your time and help in advance.

 

[blamocur]

I don't see any errors.

 

[tatibarrera231]

Thank you for your feedback, I really appreciate it

 

[Steven G]

In the 2nd blue box you forgot to add the 3 in x_c + 3

 

[tatibarrera231]

In the 2nd blue box you forgot to add the 3 in xc + 3

would that fix it?