Image Formation by a Concave Lens

A concave lens has a focal length of -15 cm. An object is placed 30 cm from the lens. Using the lens formula, calculate the position of the image formed by the lens. The lens formula is given by:

1/f = 1/v - 1/u

where f is the focal length, v is the image distance, and u is the object distance (taken as negative in the sign convention).