Find the equation of the sphere if one of its diameters has endpoints (-7, -5, -3) and (-5, -1,3). = 0. Find an equation of the sphere that passes through the origin and whose center is (9, -7, -10). = 0 Note that you must put everything on the left hand side of the equation and that we desire the coefficients of the quadratic terms to be 1. Find an equation of the largest sphere with center (3, 8, 2) that is contained completely in the first octant. = 0 Note that you must move everything to the left hand side f the equation that we desire the coefficients of the quadratic terms to be 1.