Why it is wrong?

Entered Answer Preview (x"2)+(y"2)+(z"2)-4*x+18*y-25*z+83 2:2 + 312 + 22 4:: + 18y 252 + 83 Find the equation of a sphere if one of its diameters has endpoints: (1, 12, 2) and (5, 6, 8). (XA2+y/\\2+z/\\24x+18y252+83) = 0 Note that you must move everything to the left hand side of the equation and that we desire the coefficients of the quadratic terms to be 1