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Coursera Machine Learning Week 1 Quiz Answers – Linear Algebra  Andrew NG
1. Let two matrices be
,
What is A – B?
1. Let two matrices be
,
What is A + B ?

Correct
To multiply the vector x by 2, take each element of x and multiply that element by 2.

3. Let u be a 3dimensional vector, where specifically
What is ?
4. Let u and v be 3dimensional vectors, where specifically
and
what is ?
(Hint: 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 and .) Do not add brackets to your answer.
Answer: 4
5. Let A and B be 3×3 (square) matrices. Which of the following must necessarily hold true? Check all that apply.
5. Let A and B be 3×3 (square) matrices. Which of the following must necessarily hold true? Check all that apply.
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