Hello,
The inverse of the function is f^-1(X)=-3-x
How?
f (x)=-x-3
replace f(X) with y
y=-x-3
interchange the variables
x=-y-3
solve for y and replace f^-1 (X)
Hope this helps
[tex]f^{-1}[/tex](x) = x - 3
let y = x + 3 and rearrange making x the subject
x + 3 = y ← ( subtract 3 from both sides )
x = y - 3 ( change y to x )
[tex]f^{-1}[/tex]( x) = x - 3
