Question 930469
Let f(x)=3x-5 Find the following.
(a)f(3) (b)f(h) (c)f(3)+f(h) (d) f(3+h) 
.
(a)f(3)
replace x with 3 and evaluate:
f(x)=3x-5
f(3)=3(3)-5
f(3)=9-5
f(3)=4
.
(b)f(h)
replace x with h and evaluate:
f(x)=3x-5
f(h)=3h-5
.
(c)f(3)+f(h)
from (a): f(3)=4
from (b): f(h) =3h-5
so
f(3)+f(h)=4 + 3h-5
f(3)+f(h)=3h-1
.
(d) f(3+h) 
replace x with 3+h and evaluate:
f(x)=3x-5
f(3+h)=3(3+h)-5
f(3+h)=9+3h-5
f(3+h)=3h+4