Great Deal! Get Instant \$25 FREE in Account on First Order + 10% Cashback on Every Order Order Now

# Math 1104C, 1104J: Test # 1, Due Feb. 9 11:59, 2022 Directives: • This document has 2 pages (including this page). • This assignment is due on February 9th at 11:59 on Brightspace. • The assignment...

Math 1104C, 1104J: Test # 1, Due Feb. 9 11:59, 2022
Directives:
• This assignment is due on Fe
uary 9th at 11:59 on Brightspace.
• The assignment has 8 questions for a total of 40 points.
• You must show your work when appropriate. We look at lot more at your work than you
IMPORTANT:
or an electronic tablet or use latex.
Instructions to submit your assignment online
• You must send a scan or a picture of your work. It must clear enough so that we can read what you
wrote. We are only marking what we receive so make sure to send complete files.
• only .pdf and .jpg files are accepted.
• Make sure to submit your work at the appropriate link of the exam on Brightspace.
• Only the last version of a file or document that you submit is marked.
• No late work will be accepted.
You can contact me by email at XXXXXXXXXX.
1
mailto: XXXXXXXXXX
1. (5 points) Use Gauss-Jordan elmination to find all solutions to the linear system:
x1 + 3x2 + 2x3 + 4x4 = 2
x3 + x4 = 2
2x1 + 6x2 + 3x3 + 7x4 = 2
2. (5 points) Let
A =
 XXXXXXXXXX 0
XXXXXXXXXX
 ~b =
11
1

Find the reduced row echelon form of (A|~b). Use it to find a solutions to A~x = ~b.
3. (5 points) Solve the system A~x = ~0 using the matrix A from question 5.
4. (6 points) Let A =
(
1 0 −1
1 1 1
)
. Is ~b =
(
3
2
)
in the span of the columns of A? Is ~w =
(
−1 1 1
)
in
the span of the rows of A?
5. (6 points) Let
A =
(
3 −1 2
−1 2 4
)
, B =
 1 2−1 −2
0 3
 , C = (0 1
1 0
)
Evaluate the following expressions if they make sense.
(a) CB
(b) BC
(c) AB + C
(d) BA + C
(e) CT + C
(f) B + AT
6. (3 points) Give an example of a matrix M where MMT and MTM are not equal matrices.
7. (5 points) Is
P =
(
8 1
5 −2
)
a linear combination of the three matrices
Q1 =
(
1 1
1 1
)
, Q2 =
(
0 1
−1 0
)
, Q3 =
(
1 0
0 −1
)
8. (5 points) Find the inverse of the following matrix: 1 1 −10 1 1
0 1 −1

Page 2