Given the function f(x) =x+3 witch of the following represents f-1(x)?

(x) = x - 3

Step-by-step explanation:

let y = f(x) and rearrange making x the subject, that is

y = x + 3 (subtract 3 from both sides )

y - 3 = x

Change y back into terms of x with x = (x) , thus

(x) = x - 3

if you was gonna solve for a, a is a   < -12