# How do you find the cross product and verify that the resulting vectors are perpendicular to the given vectors <-3,-1,2>times<4,-4,0>?

Oct 28, 2016

The cross product 〈8,8,16〉

#### Explanation:

The cross product of 2 vectors vecu=〈u_1,u_2,u_3〉 and vecv=〈v_1,v_2,v_3〉 is given by

$\vec{u}$x$\vec{v}$ =〈u_2v_3-u_3v_2,u_3v_1-u_1v_3,u_1v_2-u_2v_1〉
This vector is perpendicular to $\vec{u}$ and $\vec{v}$

So the cross product of 〈-3,-1,2〉 and 〈4,-4,0〉 is 〈8,8,16〉

Verification by making the dot product
〈-3,-1,2〉.〈8,8,16〉=-24-8+32=0
and 〈4,-4,0〉.〈8,8,16〉=32-32+0=0

As both dot products are $= 0$ so the vector is perpendicular to the other 2 vectors