# What is the angle between #<7 , -2 , -4 > # and # < 5 , -2 , 1 > #?

##### 1 Answer

Nov 12, 2016

#### Explanation:

Compute the dot-product:

Compute the magnitude of both vectors:

The other way to compute the dot-product is:

where

Substitute the values that we have computed:

Solve for