Your question is very vague. If you are asking about the
definition of function, then it is "a set of ordered pairs such that no two pairs have the same first member". Often, it is enough to write a "formula" such as "
" which tells us how, given the first member, to find the second member of each pair. Strictly speaking, we must also specify what numbers the "first member" (x) can be- that is, specify the "domain"- but typically that is the set of all numbers for which the formula
can be calculated.
Since you ask about "question that ask me about the Function of (X)", if you were to post the actual questions, we might be able to help you more.