assistance using text and forumula

hi

i am trying to add some text in to a calculation however i cant seem to figure it out.

basically i have the cell to check 1 cell against another cell for a value. if it fails the requirements then i want the output to be (x1)@(x2)
where
x1 = (number from cell)
@ = Text
x2 = (number-(number*number))

so far i have this

=IF(F2>=B2,(C2-E2),IF(B2>D2,"",(C2-(A2*B2))))


for the last false statment (in bold) i want it to read (B2)@(C2-(A2*B2)

does that make sense?