The curve in the diagram has equation y=3e−x−1 .
Graph of the curve y = 3e^{-x} - 1. The curve is a decreasing exponential function. It crosses the y-axis at (0, 2) and the x-axis at point A. A vertical line is drawn from x = 2 to the curve. The region between the curve and the x-axis from x = 0 to x = 2 is shaded.