Explain the difference between a undefined term and defined term
in geometry

The difference between defined and undefined terms is that the defined terms can be combined with each other and with undefined terms to define still more terms.These are undefined terms:1.plane 2.point 3.line. 
These are defined terms:1.ray 2.union of sets 3.space 4.subset 5.set 6.proper subset 7.opposite 

The coordinates of the center of this circle are (5, -7), so moving the circle 3 units right would add 3 on to the x coordinate, making it (8, -7). Then, you have to move up 9 units, adding 9 on to -7 and giving your y coordinate as 2. This makes your final coordinates (8, 2), so your equation is:
(x - 8)² + (y - 2)² = 16

I hope this helps!