The graph of a function on the form where is a positive number, is translated units to the left of that of Here we can write as follows. Therefore, the graph of is a horizontal translation units left of the graph of Let's have a look in Ron-Jon's diagram. We will mark a few corresponding points in both graphs and measure the distance between them.
We can see that Ron-Jon's graph is translated horizontally units but in the wrong direction. He should have translated it to the left instead. This is the error. Let's see how the correct graph looks like.