If you have a negative sign in front of the "x",  this represents what type of transformation?

A negative sign in front of the "x" in a function represents a reflection of the graph of the function across the y-axis. This is a type of transformation in the field of mathematics, specifically in function graphing.

Here are the steps to visualize this transformation:

1. Start with the original function. For example, y = f(x).
2. Replace x with -x in the function. The new function is y = f(-x).
3. Now, compare the graph of y = f(x) and y = f(-x). You will notice that the graph of y = f(-x) is the mirror image of the graph of y = f(x) with respect to the y-axis.
4. This mirror image or flipping of the graph across the y-axis is the transformation represented by the negative sign in front of the "x".

So, in summary, a negative sign in front of the "x" in a function represents a reflection across the y-axis.