If you or your class members are interested in how the quadratic formula is derived, then take a look at this video! The tutorial takes you through each step necessary to derive the quadratic formula from the general form for a quadratic...

This podcast will give students an introduction and an example of the working of mathematical proof by induction. The presentation includes only two steps, which are explained thoroughly, and one example which students will understand....

This podcast expands upon the previous podcast, Mathematical Induction I, by introducing the case in which a proof is only meant to be valid for a certain set of numbers (ie, the proof may fail until the variable is higher than a certain...

In this podcast, which follows from Mathematical Induction Parts I and II, the narrator shows how to expand induction into the Principle of Strong Induction (used for more hard-to-prove theorems). The narrator runs through a few...

The resource includes two hours of video broken into nine chapters that explores dimensions, complex numbers, and proof. Commentary is available in a variety of languages and background information on the nine chapters is provided.

This lesson [8:19] will demonstrate the use of CPCTC in triangle congruency proofs. It is 1 of 4 in the series titled "CPCTC."

Grouping terms in order to factor a quadratic that includes trigonometric expressions is demonstrated here. This lesson is 6 of 7 in the series titled "Solving an Equation by Factoring a Trigonometric Quadratic by Grouping."

Using a half angle trigonometric identity to help solve an equation is show here. This lesson is 6 of 7 in the series titled "Solving an Equation by Applying a Half Angle Identity."

A theorem is a general mathematical statement that can be used to help solve all sorts of problems. Watch this tutorial for an introduction to theorems. [4:11]

In this video tutorial students explore a proof using similar triangles.

This video explores proving the ratios between the sides of a 30-60-90 triangle.

Students explore how to do a geometric proof by contradiction.

Students explore the Pythagorean Theorem by exploring a visual proof of the Theorem as they watch a video tutorial.

This geometry resource discusses two types of proof. Video lessons demonstrating a flow proof and a two-column proof are included.

Inductive reasoning is observing data and patterns to make predictions. Watch this tutorial to learn about inductive reasoning. [3:48]

Students learn how to prove that two triangles are congruent using midpoint of line segments.

Video tutorial provides examples and tips for proving an identity. [3:34]

This QuickTime movie provides an opportunity to develop the basic geometric term, similar, by checking to see if figures are proportionaly similar. As you watch and listen to the teacher and student interact it helps clarify the thinking...

Sal considers two cases of polynomial identities and their proofs. [7:38]

Dr. Greg Ganssle discusses the role of deductive arguments and evidence in deciding what to believe, both in philosophy and more generally.

This lesson will help a learner understand counterexamples. It is 5 of 7 in the series titled "Counterexamples." [3:49]

This lesson will help a learner understand counterexamples. It is 6 of 7 in the series titled "Counterexamples." [1:54]

The process of factoring a common value or expression from multiple terms in a trigonometric equation is shown here. This lesson is 5 of 7 in the series titled "Finding a Common Factor for a Trigonometric Expression."