Question 796748
Hi there, it has been a while since i have done these but if i remember whatever is in the brackets you sub in to wherever you see x..

{{{f(x)=-2x+5}}}

f(1/2) = -2(1/2) + 5
= -1 + 5 = 4

f(x+2) = -2(x+2) + 5
= -2x -4 + 5 = -2x + 1

any further questions please feel free to email me