The sum of the areas for the right-endpoint rectangles of the function
. Use what you know to find the sum of the areas of the right-endpoint rectangles of on .
in the express raises the function up . So the total area is increased by because the base was .
Find the sum of the
right-endpoint rectangles for for .
Since the whole graph is raised up
and the base is still , how much more area would the new function have than ?