Can any one me on this one a little stuck on this one

The general form of the quetion of a circle is ax^2+by^2+cx+dy+e=0 where a=b=0 if the circle has a radius of three units and the center lies on the y axis which set of values of a, b, c, d, and e might correspond to the circle

Is this a polynomial function? i need to know asap

If (x-2) 2= 49, then x could be a. -9 b. -7 c.- 2 d. 5 e.9