I am looking for help with the following formula

=IF(AND(H45<$B$1,A45<207003),($B$1-H45)/(H45-G45)*I45,($B$1-H45-($B$1-H45)/7)*2)

I want to have something else onto the formula which says that if the entry
is less than 0 then enter ""

Any ideas?
Thanks