Question: Inserting number into equlation and getting the right output?

Hi

Im new to programming in maple and need some help.

I have this function, lets say it is f= x2 and i have a constant called c (lets say it is 2 for now)

I use the command subs, but this could be wrong.

i write :

subs(x=c,f)

The output the becomes 4, when i would like i to be 22 . Put in other words, how can I get maple NOT to calculate the result?

Thanks.

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