TAUC05Find the area under the curve y =
x3-
1 from x = 1 to x = 3.
Graph the curve
over the range of interest.
This is a cubic. It rises steeply, and it
crosses the y-axis at
and
the x-axis at 1 and goes through the point (3,8). The rectangle
represents one of the rectangles that is being summed in the integration
process.