Thread: Finding two integrals

Hello. I am having trouble with four problems from my homework.
I don't know why but the answers I get seem wrong and I am not quite sure what I am doing. (although happily i think I completed the rest with no problems yay! just these four are killing me!)
I also am in a situation where I can't spend too much time online so any help is appreciated!

I guess I can start with two questions.


I need to make a substitution and then evaluate the integral but i think i am doing the substitution part incorrectly.

and



thank you!

Originally Posted by curimath

Hello. I am having trouble with four problems from my homework.

I don't know why but the answers I get seem wrong and I am not quite sure what I am doing. (although happily i think I completed the rest with no problems yay! just these four are killing me!)
I also am in a situation where I can't spend too much time online so any help is appreciated!

I guess I can start with two questions.

I need to make a substitution and then evaluate the integral but i think i am doing the substitution part incorrectly.

and

thank you!

1) Substitute and you get a standard form.

2) Substitute and the problem essentially reduces to finding which you should know how to do.

thank you!

helped me a lot! :)