Uploaded June 2023 | Updated September 2026, 2 weeks ago
Enhance your math contest skills from Brilliant: ๐brilliant.org/blackpenredpen (20% off with this link!)
This question is from the Stanford Math Tournament (SMT) the algebra tiebreaker section stanfordmathtournament.com/archive/2023. We are given a cubic function f(x)=x^3-6x^2+25/2x-7 and we know there exists a closed interval [a,b] such that the sequence x, f(x), f(f(x)), ... is bounded for x on [a, b]. This question is fascinating because not all cubic functions have such properties. I will use the fixed-point approach for this problem, how would you solve this? #brilliant #math #stanford #blackpenredpen
0:00 Stanford Math Tournament algebra tiebreaker
1:00 Check out Brilliant
2:10 My solution to this problem
7:12 Why my solution works for this problem
Note: I avoided calculus derivative here because I wanted to keep it with just algebra. I will do another video on the fixed-point iteration later.
9:56 the official solution
๐ช Support the channel and get featured in the video description by becoming a patron: patreon.com/blackpenredpen
AP-IP Ben Delo Marcelo Silva Ehud Ezra 3blue1brown Joseph DeStefano
Mark Mann Philippe Zivan Sussholz AlkanKondo89 Adam Quentin Colley
Gary Tugan Stephen Stofka Alex Dodge Gary Huntress Alison Hansel
Delton Ding Klemens Christopher Ursich buda Vincent Poirier Toma Kolev
Tibees Bob Maxell A.B.C Cristian Navarro Jan Bormans Galios Theorist
Robert Sundling Stuart Wurtman Nick S William O'Corrigan Ron Jensen
Patapom Daniel Kahn Lea Denise James Steven Ridgway Jason Bucata
Mirko Schultz xeioex Jean-Manuel Izaret Jason Clement robert huff
Julian Moik Hiu Fung Lam Ronald Bryant Jan ลehรกk Robert Toltowicz
Angel Marchev, Jr. Antonio Luiz Brandao SquadriWilliam Laderer Natasha Caron Yevonnael Andrew Angel Marchev Sam Padilla ScienceBro Ryan Bingham
Papa Fassi Hoang Nguyen Arun Iyengar Michael Miller Sandun Panthangi
Skorj Olafsen Riley Faison Rolf Waefler Andrew Jack Ingham P Dwag Jason Kevin Davis Franco Tejero Klasseh Khornate Richard Payne Witek Mozga Brandon Smith Jan Lukas Kiermeyer Ralph Sato Kischel Nair Carsten Milkau Keith Kevelson Christoph Hipp Witness Forest Roberts Abd-alijaleel Laraki Anthony Bruent-Bessette Samuel Gronwold Tyler Bennett christopher careta Troy R Katy Lap C Niltiac, Stealer of Souls Jon Daivd R meh Tom Noa Overloop Jude Khine R3factor. Jasmine Soni L wan na Marcelo Silva Samuel N Anthony Rogers Mark Madsen Robert Da Costa Nathan Kean Timothy Raymond Gregory Henzie Lauren Danielle Nadia Rahman Evangline McDonald Yuval Blatt Zahra Parhoun Hassan Alashoor Kaakaopuupod bbaa Joash Hall Andr3w11235 Cadentato Joe Wisniewski Eric Maximilian Mecke
----------------------------------------
Thank you all!
Enhance your math contest skills from Brilliant: ๐brilliant.org/blackpenredpen (20% off with this link!)
This question is from the Stanford Math Tournament (SMT) the algebra tiebreaker section stanfordmathtournament.com/archive/2023. We are given a cubic function f(x)=x^3-6x^2+25/2x-7 and we know there exists a closed interval [a,b] such that the sequence x, f(x), f(f(x)), ... is bounded for x on [a, b]. This question is fascinating because not all cubic functions have such properties. I will use the fixed-point approach for this problem, how would you solve this? #brilliant #math #stanford #blackpenredpen
0:00 Stanford Math Tournament algebra tiebreaker
1:00 Check out Brilliant
2:10 My solution to this problem
7:12 Why my solution works for this problem
Note: I avoided calculus derivative here because I wanted to keep it with just algebra. I will do another video on the fixed-point iteration later.
9:56 the official solution
๐ช Support the channel and get featured in the video description by becoming a patron: patreon.com/blackpenredpen
AP-IP Ben Delo Marcelo Silva Ehud Ezra 3blue1brown Joseph DeStefano
Mark Mann Philippe Zivan Sussholz AlkanKondo89 Adam Quentin Colley
Gary Tugan Stephen Stofka Alex Dodge Gary Huntress Alison Hansel
Delton Ding Klemens Christopher Ursich buda Vincent Poirier Toma Kolev
Tibees Bob Maxell A.B.C Cristian Navarro Jan Bormans Galios Theorist
Robert Sundling Stuart Wurtman Nick S William O'Corrigan Ron Jensen
Patapom Daniel Kahn Lea Denise James Steven Ridgway Jason Bucata
Mirko Schultz xeioex Jean-Manuel Izaret Jason Clement robert huff
Julian Moik Hiu Fung Lam Ronald Bryant Jan ลehรกk Robert Toltowicz
Angel Marchev, Jr. Antonio Luiz Brandao SquadriWilliam Laderer Natasha Caron Yevonnael Andrew Angel Marchev Sam Padilla ScienceBro Ryan Bingham
Papa Fassi Hoang Nguyen Arun Iyengar Michael Miller Sandun Panthangi
Skorj Olafsen Riley Faison Rolf Waefler Andrew Jack Ingham P Dwag Jason Kevin Davis Franco Tejero Klasseh Khornate Richard Payne Witek Mozga Brandon Smith Jan Lukas Kiermeyer Ralph Sato Kischel Nair Carsten Milkau Keith Kevelson Christoph Hipp Witness Forest Roberts Abd-alijaleel Laraki Anthony Bruent-Bessette Samuel Gronwold Tyler Bennett christopher careta Troy R Katy Lap C Niltiac, Stealer of Souls Jon Daivd R meh Tom Noa Overloop Jude Khine R3factor. Jasmine Soni L wan na Marcelo Silva Samuel N Anthony Rogers Mark Madsen Robert Da Costa Nathan Kean Timothy Raymond Gregory Henzie Lauren Danielle Nadia Rahman Evangline McDonald Yuval Blatt Zahra Parhoun Hassan Alashoor Kaakaopuupod bbaa Joash Hall Andr3w11235 Cadentato Joe Wisniewski Eric Maximilian Mecke
----------------------------------------
Thank you all!
