Yes, it can be solved for both r and t.
Do you know how to rearrange the equation into the form of ax^2 + bx + c = 0 and put it onto the quadratic formula?
I think you factorised wrong... maybe you should try again? As I can see from the equation, there are two r^2 parts. So where'd the second part go?
Also it may pay to learn LaTeX so it is easier to understand.
LaTeX Tutorial