# Math Help - Vector Expressions

1. ## Vector Expressions

u (3,-1,4) v (5,2,-1) w (8,1,-2)

Evaluate each expression

l u x v l squared + (w dot w)

l u x v l squared -lvl squared lul squared

2. Originally Posted by peon123
u (3,-1,4) v (05,2,-1) w (8,1,-2)

Evaluate each expression

l u x v l squared + (w dot w)

l u x v l squared -lvl squared lul squared
What part or parts do you have trouble doing?
These are rather simple.

3. is l u x v l squared same thing as ( lul x lvl) squared? so just multiply the magnitudes and square them?

4. Originally Posted by peon123
is l u x v l squared same thing as ( lul x lvl) squared? so just multiply the magnitudes and square them?
$u \times v$ is the cross product of the vectors.
Find that product then its length.