# Vectors and properties of cross products

• Sep 19th 2013, 03:25 PM
Vectors and properties of cross products
The problem that I am unsure about is: k x (i - 2j). What are the rules for adding and subtracting vectors like this?
• Sep 19th 2013, 04:06 PM
Plato
Re: Vectors and properties of cross products
Quote:

The problem that I am unsure about is: K x (i - 2j). What are the rules for adding and subtracting vectors like this?

Be careful about notation, in particular capitalization.
I think you mean: $k\times(i-2j)~?$

The rules are: $\vec{a}\times(\vec{b}+\vec{c})=(\vec{a}\times\vec{ b})+(\vec{a}\times\vec{c})$ and $(\alpha\vec{ a}\times\vec{b})=\alpha(\vec{a}\times\vec{b})$
• Sep 19th 2013, 04:09 PM