For this case we have that by definition, the area of a square is given by:
[tex]A = l ^ 2[/tex]
Where "l" is the side of the square.
Let "x" be the variable that represents the side of a square.
So, the area of this square will be given by the following function:
[tex]y = f (x)[/tex]
Where:
[tex]f (x) = x ^ 2[/tex]
Answer:
[tex]f (x) = x ^ 2[/tex]
