1. The problem statement, all variables and given/known data Find the equation of the tangent line to y=sqrt(25-x^2) at the point (4,3) 2. Relevant equations 3. The attempt at a solution (25-x^2)^1/2 1/2(25-x^2)^-1/2 (2x)1/2(25-x^2)^-1/2 x(25-x^2)^-1/2 I have no idea what to do or where to go after this... Please Help!