An illustration of the Intermediate Value Theorem (A consequence of continuity). As with many theorems in Calculus, this one guarantees a solution, but doesn't really demonstrate how to find it. So there is a worksheet to illustrate the bisection method, [url]http://tube.geogebra.org/student/b78228#material/146614[/url] , and one to illustrate the secant method, [url]http://tube.geogebra.org/student/b78228#material/146615[/url] , to finding exactly where f(x) = 0.