Calculator keeps giving different answer than book, is the order wrong?

If the book is giving two ansers, most likely it is a quadratic formuloa, which either youre calculator can not do or you are inputting it incorrectly. If you can not solve the quadratice using your head, Use the formula:

Were you solving a quadratic equation?  Did you use the quadratic formula?

What was the original problem?

I believe that a mistake was made before you got the answer (-3 +√11)/2.

Replace the sqrt(11) term with sqrt(29) and you'll get the book's answers.  

Don't forget that sqrt(29) can be positive or it may be negative. Try both.