Topic: use function notation to evaluate equations. Evaluate the given equations for the indicated function values

Question

The questions I need help with;

f(n)=5^n
f(2)=
f(3)=

and

f(n)=-n
f(9)=
f(-11)=

Please, explain & help me :(

Answer 1

If f(n) = 5^n
then f(1) = 5^1 = 5

just replace all the n's with whatever you want. If that's numbers, then you can evaluate the result.

f(n) = -n
f(-3) = -(-3) = 3
and so on.

Answer 2

So, I just replace the letters with whatever number I want then I evaluate? How do I evaluate?

Answer 3

oh come on. I showed you two examples. Surely you can do arithmetic.