Solution 1.

See text and/or instructor's solution manual.

Answer.   ,  

where      is the multi-valued square root function.  

Solution.   The equation      implies that   .  

Use the quadratic formula and obtain   

                      

Therefore,  

                    .

where      is the multi-valued square root function.  

We are done.   

Aside.  We can let Mathematica double check our work.

Remark.  Sometimes we write this as   .  

This solution is complements of the authors.

(c) 2008 John H. Mathews, Russell W. Howell