Question

Can x in f(x) be replaced by another letter? For example f(a);Would that be the same thing?

Answer 1

Answer: It should be the same thing. The x and the a just represent variables. If you had f(2) you would plug that in the x spot, so it should be the same if it were a instead of x.

Explanation:

Answer 2

Yes

Explanation:

X is just an unknown variable which can be substituted as another variating condition. I.E Function of x can be written as Function of a. If no other condition is present.