Looking at the factors above, the common ones are 1, 2, 3, 4, 6, 9, 12, 18, and 36. But... considering we are looking for the "greatest" common factor, our highest number out of the listed ones is 36, making it the greatest common factor of 72 and 36.
(y−3)2=16(x−2) is the equation of the parabola. Explanation: Whenever vertex(h,k) is known to us, we must preferably use the vertex form of the parabola: