Quadratic equation - Review

[sanjay]

Hi Everyone
Hope you all are doing well.
I have started teaching online using the youtube platform. Could you review the content of my channel and give suggestion to further imrpove it.
I am a beginner here and your advice will definitely work for me
Here is the link of my channel

Dr. Sanjay Keshri

This channel provide maths tutorials and is exclusively aimed to strengthen the base of Leaving cert Maths students. The channel content gives them a solid b...

www.youtube.com

Regards
Sanjay

 

[JeffM]

I looked at your video. I have a number of observations.

The graphical method of finding the roots of a quadratic works only if you have a graphing calculator. If you do not have a graphing calculator, you must sketch the curve to use that method, but you have not explained how to sketch a parabola, which requires determining the roots. The whole thing is circular. Furthermore, in most cases, a graphing calculator will not give an exact answer.

You explain what a, b, and c are and then ignore that exposition by jumping to solving a quadratic by factoring. It seems to me that a better organization would be to show first factoring and graphing as quick methods that work in special cases and then go to the quadratic formula as a universal method.