# What is # || < 4 , 9 , -8 > || #?

##### 1 Answer

Feb 17, 2016

#### Answer:

The two vertical lines just mean 'the length of' the vector:

#### Explanation:

Probably not a lot more explanation is needed. The formula for finding the length of a vector is something you should know because it is used very frequently.

It's probably worth noting that although this is a vector in three dimensions, it is still a square root, not a cube root.