Thank you Lynn for the math work. Quickly checking the math you are correct the the equation can be simplified as quadratic equation and solved but the constant need be double checked.
However, I read you post after making my way around the problem and I am interest to see it working. I used string concatenate to write formula string and zeros and exterima to find the zeros. The code works but gives results the most stupid high school student will never give. If you do not mind have a look
