What multiplies to -120 and adds up to 7

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

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

Can someone me and plz do the problem