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+--- Thread: Focus of a Parabola (/thread-12033.html)
Focus of a Parabola - MullenJohn - 12-27-2018 04:57 PM
Is there any way to find the focus of a parabola (e.g. 2x^2 -x -1) using the HP Prime. I cannot find a way to do it. If you have found a way please tell me the steps. Cheers!
RE: Focus of a Parabola - toshk - 12-27-2018 06:13 PM
(12-27-2018 04:57 PM)MullenJohn Wrote: Is there any way to find the focus of a parabola (e.g. 2x^2 -x -1) using the HP Prime. I cannot find a way to do it. If you have found a way please tell me the steps. Cheers!
http://www.hpmuseum.org/forum/thread-10605.html
Conics(y-(2*x^2-x-1))
RE: Focus of a Parabola - MullenJohn - 12-27-2018 06:34 PM
Thank You Toshk.
I was looking for a built-in HP Prime function like something under Catlg or CAS, et cetera. Is there anything like finding the focus with a built-in HP Prime function? Cheers!
RE: Focus of a Parabola - toshk - 12-27-2018 06:37 PM
(12-27-2018 06:34 PM)MullenJohn Wrote: Thank You Toshk.
I was looking for a built-in HP Prime function like something under Catlg or CAS, et cetera. Is there anything like finding the focus with a built-in HP Prime function? Cheers!
reduced_conic(y-(2*x^2-x-1))
RE: Focus of a Parabola - MullenJohn - 12-28-2018 02:37 PM
Thank you Toshk. I was unaware of the function reduced_conic().
I was unable to determine from the results of reduced_conic(y-(2x^2+3x+1)) which item would tell me the focus (-3/4, 3/8) or the focal length (p = 1/8).
Which part of the result states the focus coordinates or the focal length p = 1/4a?
Cheers!