Conic Sections: Parabolas, Part 2 (Directrix and Focus)

Conic Sections: Parabolas, Part 2 (Directrix and Focus). In this video, I discuss how to go about finding the directrix and the focus for a parabola and do a couple of examples.

Category:

Education

Tags:

• math
• algebra
• conic
• section
• parabola
• vertex
• directrix
• focus

[Lisnageeragh]

Are parabolas a subset of hyperbolas?

[patrickJMT]

@Lisnageeragh no

[versatileVenice143]

0:13 onwards you said five thirds instead of three fifths but it's okay.. you're still awesome.. :))

[patrickJMT]

@versatileVenice143 ops!

[WithxAxVengeance]

Just watching the first three minutes cleared up my doubt, thanks so much!

[patrickJMT]

@WithxAxVengeance my pleasure.

[DullahOblongata]

Ok so my teacher spent 2 days trying to teach this and i never got it... tomorrow is my final exam and luckily i found your video, and now i totally know how its done, thank you so much man, that means a lot not only to me, but to everybody else.

p.s When i need help in any math subject, i come to your channel first <3

[WHY70122]

@5:17 it should be 1/4(x-3)=(y-1)^2 right? U forgot to cancel 4 with 1/4 on the right hand side of the equation.

[engineerrob1]

think*

[engineerrob1]

on 5:00 you missed multiplying the the 1/4 on the right side, I thing that's what @Lisnageeragh got confused by.

[hermin0000]

I don't understand how you got the vertex

[andres220]

@Lisnageeragh

5:15, if i were to expand this out.... how the hell did you get 4p=1/4? ahhhhhrrr

[TVInformative]

how do i find the focus and directorix of an equation 16x^2-8y=0

[64Kmo]

i like how his handwriting is easily readable and thanks cleared up my math homework :)

[yahjee23]

You are very gifted! And thank you so much for sharing your gift with us. :) I owe you big time for your videos!!