What you give as the "correct answer", is NOT equal to . You appear to have done the "partial fractions" incorrectly.

The formula you are given is for but the problem is . Either use the substitution u= -x or write the problem asThis is #9(where again I got close to the answer but it's not negative): http://i.imgur.com/irn4fUd.jpg

My work: http://i.imgur.com/VGdxQkx.jpg

Use the substitutionThis is #11(which I've done before but looking at it again I'm very confused and have no understanding of my work. It'd be nice if someone could show me this one step by step): http://i.imgur.com/8RKTBfe.jpg

My work: http://i.imgur.com/nexHgNv.jpg