Area Between Two Functions

If two functions $f(x)$ and $g(x)$ intersect at $x=1$ and $x=3$, and $f(x) \ge g(x)$ for all $1 \le x \le 3$, then the area of the shaded region between their points of intersection is given by: $$A=\int_{1}^{3}{\big[f(x)-g(x)\big]}dx$$ Area between Two Functions

Example 1

Find the area bounded by the $x$-axis and $y=x^2-4x+3$.

Example 2

Find the area bounded by the $y=x+2$ and $y=x^2+x-2$.

Example 3

Find the area bounded by the $x$-axis and $y=x^3-x^2-2x$.