Given f(x)=2x+4, find f(a-4)

Question

a) 2a-4
b) 2a
c) a+2
d) a-4

Answer 1

To solve functions like this plug (a-4) into the equation for each instance of x.

For your equation it would be setup like this:

f(a-4)=2(a-4)+4
f(a-4)=2a-8+4
f(a-4)=2a-4

So the answer is A) 2a-4

Answer 2

thank you so much