Quadratic Formula Proof

[chrisrocks750]

we learned quadratic formula in algebra, last year when i was 12. of course i didn't understand it so i just went with the flow and used it to find the X intercepts of my parabola. this video helped me understand how it was derived...

[dinosaurzez]

this is like one week of math class condensed into 46 seconds

[ClauCanaya]

Very good video ! it helped me a lot !

[math314]

@koolkidds69skateteam in algebra 2 you learn completing the square but you won't have to prove the quadratic formula. Your teacher might derive the quadratic formula to show when completing the square can be used.

[MrOver9000dollars]

I'm doing this right now. Hard. Espcially when "i" comes into play. Who ever heard of a fake number?

[TyYann]

Nice.

But at 0:04, it should be "equation", not "function".

And at 0:11, the lower anotation, you say you take the half of bx/a, but you actually take the half of b/a.

[math314]

@TyYann thanks for letting me know. It would be function if it was f(x) = ax^2 + bx +c but since it's ax^2 + bx + c = 0 it's an equation.

[TyYann]

@math314 You got it!

[math314]

@TyYann thanks. also i noticed at 0:12 i put quadratic equation

[v00per]

i understood none of that but it made me happy :)

[math314]

@v00per yeah I'm about to add annotations with explanations so that it hopefully makes more sense. I'm glad it made you happy :)