# Coursera Machine Learning Week 1 Quiz Answers – Linear Algebra | Andrew NG

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### Coursera Machine Learning Week 1 Quiz Answers – Linear Algebra | Andrew NG

3.  Let u be a 3-dimensional vector, where specifically
$inline&space;u&space;=&space;begin{bmatrix}&space;2\&space;1\&space;8&space;end{bmatrix}$
What is $inline&space;u^{T}$ ?

4. Let u and v be 3-dimensional vectors, where specifically
$inline&space;u&space;=&space;begin{bmatrix}&space;4&space;\&space;-4&space;\&space;-3&space;end{bmatrix}$
and
$inline&space;v&space;=&space;begin{bmatrix}&space;4&space;\&space;2&space;\&space;4&space;end{bmatrix}$
what is $inline&space;u^{T}v$ ?
(Hint$inline&space;u^{T}v$ is a 1×3 dimensional matrix, and v can also be seen as a 3×1 matrix. The answer you want can be obtained by taking the matrix product of $inline&space;u^{T}$ and .) Do not add brackets to your answer.
5. Let A and B be 3×3 (square) matrices. Which of the following must necessarily hold true? Check all that apply.

•
•  If A is the 3×3 identity matrix, then

Correct
Even though matrix multiplication is not commutative in general ( for general matrices A,B), for the special case where , we have , and also . So, .

•
•

Correct
We add matrices element-wise. So, this must be true.

5. Let A and B be 3×3 (square) matrices. Which of the following must necessarily hold true? Check all that apply.

•  If , then C is a 3×3 matrix.

Correct

•  If A is the 3×3 identity matrix, then

Correct
Even though matrix multiplication is not commutative in general ( for general matrices A,B), for the special case where , we have , and also . So, .

•
•

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Is Andrew Ng’s Machine Learning course good?
It is the Best Course for Supervised Machine Learning! Andrew Ng Sir has been like always has such important & difficult concepts of Supervised ML with such ease and great examples, Just amazing!
How do I get answers to coursera assignment?
Use “Ctrl+F” To Find Any Questions Answered. & For Mobile Users, You Just Need To Click On Three dots In Your Browser & You Will Get A “Find” Option There. Use These Options to Get Any Random Questions Answer.
How long does it take to finish coursera Machine Learning?
this specialization requires approximately 3 months with 75 hours of materials to complete, and I finished it in 3 weeks and spent an additional 1 week reviewing the whole course.
How do you submit assignments on Coursera Machine Learning?
Submit a programming assignment Open the assignment page for the assignment you want to submit. Read the assignment instructions and download any starter files. Finish the coding tasks in your local coding environment. Check the starter files and instructions when you need to. Reference

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