Answer:B
Explanation:
make 8 become k
you have f(x)= -x+k
now change -x+k to x-k because x is a negative
now you have f(x)=x-k
now make f(x) f(x-k) because you have to subtract k from both sides
now make x-k f(x)-k because you need to show work i can't explain this part online.