This is my attempt to introduce the mystery and wonder of irrational numbers and their link to our naive notion of cause and effect. The followers of Pythagoras believed: "All is number"! Have you ever truly wondered what they meant?
In this video I will show you how to use a number line. You will learn how to find negative and positive numbers on the number line. Also, I will show you how to watch out for different "scales" used on the number line.
When asked to factor a quadratic equation such as 2x^2 - 7x -15, many students are uncomfortable with the guess and check method. I created this video to describe a 7 step method that requires NO GUESSING.
This is a lesson on solving general cubic polynomials by radicals. In this part, I discuss solving non-factorable cubics using Cardano's method. I finish up by briefly discussing a special situation called "Casus Irreducibilis".
This is a lesson on solving general cubic polynomials by radicals. In this part, I discuss solving factorable cubics. I end the discussion by looking at the cube-roots of unity.