Question 1011063
Read and study the solution posted the first time for this same question.  

<a href="http://www.algebra.com/algebra/homework/quadratic/Quadratic_Equations.faq.question.1011058.html">Same as question number 1011058</a>


Do you realize that you do not always NEED to solve a question like this purely symbolically first?  You can use the given values earlier if you want to.  There are reasons for purely symbolic solutions.  One reason is that the question type is so common and so many examples fit the same form.