That wasn’t so hard, was it? Don’t worry. The process gets more complicated, but the idea remains the
same. Now let’s generalize this and come up with a rule.
If a region is bounded by f(x) above and g(x) below at all points of the interval [a, b], then the area
of the region is given by
[f (x) = g(x)] dx
Example 1: Find the area of the region between the parabola y = 1 − x^2 and the line y = 1 − x.
First, make a sketch of the region.
To find the points of intersection of the graphs, set the two equations equal to each other and solve for x.