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The method was nicely presented. There is a new method, called Diagonal Sum Method (WikiHow.com or Enotes.com) that can solve faster. It uses a Rule of Signs, and a rule of the Diagonal Sum. Its directly selects the probable root pairs then finds the one that is true.

Example. Solve 3x^2 + 14x + ...

The method was perfectly explained. However, there is a new method, called the Diagonal Sum Method (Enotes.com, WikiHow.com), that can gives the answer faster. It used a Rule of Signs for real roots and a rule of the Diagonal Sum.

Example. Solve 10x^2 -13x - 3 = 0. Roots have opposite signs. New...

There is a new method called The Diagonal Sum method that may be faster. It uses the Rule of Sign and The Diagonal Sum of a root pair. Its concept is direct finding 2 real roots in the form of 2 fractions, knowing their sum (-b/a) and product (c/a)

Example: solve x^2 + 5x + 6 = 0. Rule of Signs i...

The video lesson is great for students who learn the solving process for the first time. However, they don't need to repeat all solving steps each time. They only need to use a simple rule when solving by the number line and test point method.

First, plot 2 real roots on the number line. They di...