for f(x) =5 - 2x find f(a+3)
f(a+3) = -2a - 1
Substitute (a+3) into f(x) to obtain f(a+3) = 5 - 2(a+3)
Then distribute the 2 to obtain f(a+3) = 5 - 2a - 6
Then subtract 6 from 5 and voila! f(a+3) = -2a - 1
for f(x) =5 - 2x find f(a+3)
f(a+3) = -2a - 1
Substitute (a+3) into f(x) to obtain f(a+3) = 5 - 2(a+3)
Then distribute the 2 to obtain f(a+3) = 5 - 2a - 6
Then subtract 6 from 5 and voila! f(a+3) = -2a - 1