How to find the determinant of a 3 by 3 matrix (3 ways) linear algebra tutorial @blackpenredpen

Updated September 2026, 1 week ago

How to find the determinant of a 3 by 3 matrix (3 ways) linear algebra tutorial

So you want to prove the cubic formula (from scratch)

A circle tangents to a hyperbola! (Harvard-MIT math tournament)

$the first 5 days of calculus 2 but the integrals get harder! Learn more calculus on Brilliant (now with a 30-day free trial): 👉https://brilliant.org/blackpenredpen/ (20% off with this link!) Today we will see what your first 5 days in your calculus 2 or AP calculus BC class is like. Calculus 2 is known as integral calculus and we usually start with learning all the integration techniques. We will cover the integral of x^2 with the reverse power rule, the integral of x*e^(x^2) with u-substitution, the integral of x^2*e^x with integration by parts, the integration of sqrt(1+x^2) with trigonometric substitution, and the integration of (2x+1)/(x^2+3x+2) with partial fraction decomposition. 0:00 day 1, reverse power rule 0:20 day 2, u sub 1:27 day 3, integration by parts 2:29 day 4, trig sub 6:16 day 5, partial fraction decomposition 8:51 Check out Brilliant 🛍 Shop my math t-shirt & hoodies: amzn.to/3qBeuw6 💪 Support the channel and get featured in the video description by becoming a patron: https://www.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 OCorrigan 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 Řehák 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!$

They didnt get this right! Berkeley math tournament integral bee

The last question from the Berkeley mini Math Tournament (for 8th graders)

calculus teacher vs I know it already student

A taste of when there are no numbers in math

Factoring a trinomial (what I learned in Taiwan vs in US)