MATH 213 Test 1 Review - Shared screen with speaker view
will this review be recorded and posted??
Can you do one like web assign 3.3b problem2?
Rank, span, solutions, dependance from looking at a matrix
Can we go over Rank?
the test stuff
relationship between vectors
Problem 10, 2019 fall practice exam
practice quiz problems 8,9,11
Could you go over problem 11 on the practice test? It’s about rank and linear independence mostly
Going over dependence with vectors and matrixs
Span, independence, trivial solution/non trivial solution
Rank for sure, and how to find the inverse of a matrix larger than 2x2
Properties of invertible matrices, and properties of transpose
I think he left
is this the only review?
I'm pretty sure. The test opens tomorrow.
i think so
I know that the TA for section 1 in Kempton's class is holding one
he’ll post this review tho
It's from 7-9 and we're going over a review test.
Unless your teacher or ta is holding another one
So do we know what is being covered here?
Daniel said that it will be largely based on our questions
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.
I made a copy of the practice test. See if this link works
we could also share our screens if we have a specific question
on the practice test
Hey does anyone have the link to the other TA review in Prof. Kempton's class?
the red marks are true right?
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 :)
^^dude facts. Those videos slap
We did this one in my class today. Row reducing it was the easiest way to do it
do only square matrices have inverses?
can you use the determinant to show that a 3X3 matrix is not investable?
Oh hahah ya that makes sense thanks!
can we go through #4 on this same test?
determinate of 3 x 3 matrix
row reduction looks easier to me
After Chloe's, can we do #2 on the 2019 test?
Are invertible matrices always linearly independent?
After Chloe and Jacob, could we do #18 on the winter test?
#18 on both tests will not be covered this semester
just good to know
we don't have to worry about span of matrices (not in my section at least)
that's what I read on the website too
we do not need to know span?
Can we do problem 4 on the practice exam also?
span of vectors yes span of matrices no
never mind, we are going over #4 rn
oh that is good to know
Were we going to 11 from this test too?
do the two lines just mean magnitude?
This one is helpful to draw vectors on a graph and draw the subtracted one to see it is false
has he gone over 12 already>
Is there a way to look at a 3x3 matrix and determine whether it's invertible or not without row reducing?
Could you do 12 after please?
Thanks for doing this review!
Thank you! Good luck everyone!