1. The problem statement, all variables and given/known data 0 = -250*(sqrt(x^2+1)-0.8)^2 + 98.1*x + 59.05 2. Relevant equations 3. The attempt at a solution I can't figure out how to solve this equation! After expanding the squared term, I still end up with a sqrt(x^2+1) and I can't figure out how to perform a substitution or something to make it a nice clean quadratic.