Question

To write a 3x1 matrix with elements 7 -2 1 use
[7]
[-2]
[1]

Answer 1

Do you mean like this all as one thing? You're right if that's your question. \[\left[\begin{matrix}7 \\ -2 \\ 1 \end{matrix}\right]\]

Answer 2

ohhh okay. I'm not exactly sure what it was asking.. This is all it said

Answer 3

When it says 3x1 this means it's a number box with 3 rows and 1 column. If it said 1x3 then it would have 1 row and 3 columns. The first number is just the number of rows down it has and the second number is how many columns it has across. Not so bad I think?

Answer 4

Gotchya