When the function f (x) = 4 (2) * is changed to f (x) = 4 (2) * -13, what is the effect?

The function would be moved down 13 units on a graph. In terms of how the values of the coordinates change, the y-value of every coordinate that could be found through the function will now be 13 less than what it used to be, while the x-value will stay the same.