When using the lens equation, a negative value as the solution for di indicates that the image
real
virtual
upright
inverted

Virtual is the right answer I think

Answer;

The image is virtual

Explanation;When using the lens equation, a negative value as the solution for di indicates that the image is virtual.A real image is an image that can be formed on a white screen, while a virtual image is an image that can not be formed on a screen.The lens equation gives the magnification of a given lens and depends on the image distance and the height of the image formed.When the image distances is positive, it means the image and the object are on the same side and thus the image is real and inverted while when the image distance is negative it means the image is behind the lens, and thus the image is real and upright.

For me a person with a phd and who knows what there talking about.i know the chances of a radiation leak is low but if it does the area within a 96.3 mile radius would be unusable because of contamination