MATH 213 Test 1 Review - Shared screen with speaker view
Moa Dijkwel
14:41
will this review be recorded and posted??
emilyhighland
15:23
Can you do one like web assign 3.3b problem2?
15:28
Rank, span, solutions, dependance from looking at a matrix
Bryson Passey
15:31
Can we go over Rank?
Delbert Ward
15:36
span
Braeden
15:40
the test stuff
Sarah Maia
15:42
relationship between vectors
Olivia Harrison
15:44
Problem 10, 2019 fall practice exam
15:49
practice quiz problems 8,9,11
Cameron
15:50
Could you go over problem 11 on the practice test? It’s about rank and linear independence mostly
David Winn
15:56
Going over dependence with vectors and matrixs
Moa Dijkwel
16:00
Span, independence, trivial solution/non trivial solution
hjamias
16:03
Rank for sure, and how to find the inverse of a matrix larger than 2x2
16:39
Properties of invertible matrices, and properties of transpose
Christopher Santos
16:48
I think he left
Ben Bohman
20:20
is this the only review?
Ammon Quackenbush
20:32
I'm pretty sure. The test opens tomorrow.
Moa Dijkwel
20:44
i think so
Jacob Christensen
20:45
I know that the TA for section 1 in Kempton's class is holding one
Moa Dijkwel
20:56
he’ll post this review tho
Jacob Christensen
21:00
It's from 7-9 and we're going over a review test.
Delbert Ward
21:10
Unless your teacher or ta is holding another one
Ben Bohman
23:10
So do we know what is being covered here?
Delbert Ward
24:29
Daniel said that it will be largely based on our questions
Ammon Quackenbush
34:00
Ammon Quackenbush
34:08
Jenna Atkinson
35:24
Which of the following statements are always true? Mark all that apply.If A is n × n and invertible, then Ax = b has a unique solution for every b ∈ Rn.If A is n × n and invertible, then its columns span Rn.If A is m × n and n < m, then the columns of A are linearly independent.If A is m × n and n > m, then the columns of A are linearly dependent.If A is m × n and n > m, then the columns of A span Rm.If A is m × n and rank(A) = n, then A is invertible.
36:05
I made a copy of the practice test. See if this link works
36:06
Ammon Quackenbush
36:27
we could also share our screens if we have a specific question
Ammon Quackenbush
36:45
on the practice test
Ben Bohman
42:51
Hey does anyone have the link to the other TA review in Prof. Kempton's class?
Jacob Christensen
43:15
https://byu.zoom.us/j/4044008726
Jacob Christensen
43:27
7-9ish
Jeremy Lakey
45:50
the red marks are true right?
46:04
yeah
Jenna Atkinson
46:04
@Jeremy, yes
Sophie Gee
01:05:19
if you guys are looking for more of a visual representation of span and linear independence etc, i would recommend watching the youtube channel 3blue1brown’s series on linear algebra!!! its just a couple of videos and the animations are super helpful :)
Jacob Christensen
01:06:01
Thanks!
Cameron
01:11:01
^^dude facts. Those videos slap
Emma Ausman
01:13:59
We did this one in my class today. Row reducing it was the easiest way to do it
Samuel Hunter
01:22:12
dependent
01:24:17
do only square matrices have inverses?
Shane LeBaron
01:25:17
can you use the determinant to show that a 3X3 matrix is not investable?
Shane LeBaron
01:25:56
Oh hahah ya that makes sense thanks!
Chloe Crawford
01:26:02
can we go through #4 on this same test?
Ammon Quackenbush
01:26:15
https://www.studypug.com/algebra-help/the-determinant-of-a-3-x-3-matrix-general-and-shortcut-method
Ammon Quackenbush
01:26:21
determinate of 3 x 3 matrix
Ammon Quackenbush
01:26:27
formula
Ammon Quackenbush
01:26:32
row reduction looks easier to me
Jacob Christensen
01:27:15
After Chloe's, can we do #2 on the 2019 test?
Nathan Riches
01:28:45
Are invertible matrices always linearly independent?
Kyle Ke
01:30:41
After Chloe and Jacob, could we do #18 on the winter test?
Sophie Gee
01:31:11
#18 on both tests will not be covered this semester
Sophie Gee
01:31:18
just good to know
Sarah Maia
01:31:19
we don't have to worry about span of matrices (not in my section at least)
Ammon Quackenbush
01:31:21
that's what I read on the website too
Dylan Skinner
01:31:46
we do not need to know span?
Ammon Quackenbush
01:31:47
Can we do problem 4 on the practice exam also?
Sarah Maia
01:31:59
span of vectors yes span of matrices no
Kyle Ke
01:32:05
ok ok
Ammon Quackenbush
01:32:18
never mind, we are going over #4 rn
Chloe Crawford
01:32:34
oh that is good to know
Josh Phelps
01:32:40
Were we going to 11 from this test too?
Joshua Katzenbach
01:40:56
do the two lines just mean magnitude?
Ammon Quackenbush
01:41:06
yes
01:41:24
This one is helpful to draw vectors on a graph and draw the subtracted one to see it is false
Kyle Ke
01:50:05
has he gone over 12 already>
Kalia Reyes
01:51:03
Is there a way to look at a 3x3 matrix and determine whether it's invertible or not without row reducing?
Kyle Ke
01:55:57
Could you do 12 after please?
02:13:16
Thanks for doing this review!
Camden
02:14:30
Thank you!
Dylan Skinner
02:14:31
Thank you! Good luck everyone!
Nathan Riches
02:14:32
Thank you!
Nathan Swihart
02:14:34
Thank you!