The graph of f(x) is shown in black.Write an equation in terms of f(x) to match the red graph.

we have
f(x)
In this problem we have a translation of the black graph to the red graph
The translation has the following rule
(x,y) ------> (x+5,y)
the translation is 5 units at right
therefore
g(x)=f(x+5)
answer is
f(x+5)