If f(x)=absolute x - 9, then find f(-x)

Question

If f(x) = abs x -9 then what is f(-x).  Please simplify answer.

Answer 1

f(-x) means to evaluate f(x) when x=-x.

 

 

f(-x) = | -x - 9 |

 

f(-x) = | -x | - 9

 

 

The "| |" is the symbol to represent absolute value.

 

I wasn't sure on the interpretation of your function, since it is not clear, so I put the two possibilities.