- #1

Lothar

- 19

- 0

## Homework Statement

See the image

http://tinypic.com/r/33z6vz5/7

## Homework Equations

The rules of dot product multiplication.

## The Attempt at a Solution

I've determined that 2 of the solutions are valid, while two of the choices are invalid. I thought C and D looked correct, making A and B incorrect. Unfortunately it wasn't so. I'm down to my last submission and I really don't know what I'm doing wrong.

Thanks you