Why Do We Need 3 Ways To Complete The Square?

We will solve this quadratic equation by completing the square with 3 different approaches.

0:00 Why do we need 3 ways?
0:17 1st way (the classic way)
1:59 2nd way (multiply by 4a first)
2:53 proving the quadratic formula blindfolded
5:20 3rd way
8:44 try this cubic equation: https://youtu.be/Jz-Z0jfs2V4

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Видео Why Do We Need 3 Ways To Complete The Square? канала blackpenredpen