Deriving the Quadratic Formula by Completing the Square

Learn how to derive the quadratic formula by completing the square in this free math video tutorial by Mario's Math Tutoring.

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[peterbraaten]

This is a good video for a student who can follow it at this speed. And thats important because many students don't need a 12 minute lesson on this and can get pretty bored with a lesson that takes that long. I've personally made a 12 minute version and I watched yours to learn how others might present it at a faster pace. I like it. I toy with the idea of doing each of my lessons twice, once in fast pace and once in a slower pace. Lot of work thought. Thanks for the video.

[okorocomfort]

I'm not a maths guru and certainly not a mathematician but from what I've seen, I think it's simpler than the one I really know

[BOB_VOX]

Mr Mario but why adding both sides by b^2/4a^2 any reason for that, or is it just like that.

[amaruobrien]

Best explanation I could find of this. Needed it for school but they taught me it weird and I didn't get it, so this was perfect. Pacing was great and your explanation was super simple and it just clicked. Great video dude!

[powertube]

Excellent. There are so many videos on the use of this equation, but not a derivation. (There is one other that I found, but "it" violated or left out algebraic steps.

[yassertariqvideo]

Thank for jogging my memory, after a hiatus of 53 years. I recall, that I used to remove (divide) a in the first step, then shift c/a to the right hand side.

[digitalsnowfall]

Why we divide "a" on the both sides of the equation at the first ?

[Kuvvii]

I Was Good Till He Started Speaking Moon Runes

[manesamson]

Hey I have a question about this equation.

[rootjim]

That was fun! I onice derived it on the back of the test but since then I have forgotten how I did it.

[MiguelAngel-tqfm]

Fantastic explanation. Much better than my teacher!!

[Zaddy]

Where are you from brother, ,,, and this type of explanation is very good

[davidoneill]

it’s difficult to see your equations....
Perhaps if you wrote larger or tighten the shot could help

[gkmaharjan]

What happened to the "x, " multiplying with "b, " the middle one? ax^2 + b("x")+c = 0.

[dont]

Thanx I am 6th standard but understood well

[larrywilcox]

Nice video: He left of the "c" third from the bottom

[wernelliftsandservice]

Your b is looking like a 6
I was confuced for long time