From the equation, you can see that (3,-2) is the center of the circle (the terms are 0 for those x,y values). The mentioned point has the same y value as the center. That's good news, because it tells us that the tangent line is exactly vertical. The x coordinate is given as x=8. Vertical lines have an equation of x=... so x=8 is the right answer.
I don’t really know exactly what you’re asking but if you’re asking what is most practical, it would be #4

So, the answer to this problem is
x = 9/2 or
x = 4.5.
(7) is the greatest common factor of 56 and 49