If we take a look at the graphs below, the red curve represents the graph of , and the dark green curve represents the graph of . The purple region falls below the red curve is bounded between

*x = h*and 1, while the blue region is bounded between

*x*= 1 and

*k*.

Now scroll the value of

*k*, do you notice that point K moves according to the

*k*value? The

*y*-coordinate of point K is the area of the blue region. Same concept applies to the value of

*h*and point H. Here comes the question, do you know how to get negative

*y*-coordinate for point H?

Betty, Created with GeoGebra