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*Not sure if vectors are pre or post calculus*

## Homework Statement

So we had a few examples of vector multiplication in class and I don't understand something.

The following vectors were multiplied:

[5 2 1] by

3

-4

7

...and the answer was14[(5*3) + 2*(-4) + (1*7)].

But in another example,

2

1

was multiplied by [-1 3]

...and the answer was

-2......6

-1......3

So why was the answer in the first example a single numerical answer while the answer to the second one was in matrix form?