Quadratic Formula by Completing the Square

In this video I solve the quadratic equation by completing the square to obtain the famous quadratic formula. I had done a similar video 13 years ago so I thought it was time to do an updated one. Completing the square involves working backwards from the quadratic equation to obtain a form that has a square, that is of the form (x + d)². From here we can take the square root and rearrange to solve for x, which obtains 2 values because of the nature of the square root.

Time stamps

• Recap on Quadratic Formula: 0:00
• Derivation by completing the square: 0:30
• Completing the square: 1:16
• Quadratic equation as a square: 2:46
• Obtaining a common denominator: 4:25
• Quadratic formula: 5:58

Notes and playlists

• Playlist: https://www.youtube.com/playlist?list=PLai3U8-WIK0EF05ExjzLbB64NgUjoV1hl
• Notes: @mes/dzekfnxh
• PDF Notes: https://1drv.ms/b/s!As32ynv0LoaIjYlhWw4dLq59fn0Xwg .

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