1. The problem statement, all variables and given/known data An object is placed a distance do in front of a concave mirror with a radius of curvature r = 6 cm. The image formed has a magnification of M = 4.3. Solve for the object's distance. 2. Relevant equations M = -di/do (1/do) + (1/di) = 2/R = 1/f 3. The attempt at a solution I've tried to rearrange the magnification equation and sub it into the spherical mirror equation in order to cancel out the di's, so I can solve for do using radius and magnification, except I'm still not even entirely sure how you would manage to make this work. How would I rearrange these equations to solve for do?