The rules are:
- f(x+c) translates f(x) c units to the left
- f(x-c) translates f(x) c units to the right
You want to translate f(x) 13 units to the right, so use rule 2 with c = 13:
g(x) = f(x-13)
Just replace the x in f(x) with x-13:
g(x) = f(x-13) = (x-13+10)2 = (x-3)2