Evaluate the expression: v ⋅ w Given the vectors: r = ; v = ; w =

Question

Evaluate the expression: v ⋅ w Given the vectors: r = <8, 8, -6>; v = <3, -8, -3>; w = <-4, -2, -6>

nincompoop · Answer

do you know how to dot product?

abdullahm · Answer

Here is how you find the dot product: $x = $ $y = $ $\ x \cdot y = (a_1 \times a_2) + (b_1 \times b_2)+(c_1 \times c_2)$

sammyalabamy · Answer

whats the third one for?

abdullahm · Answer

Which third one?

sammyalabamy · Answer

the r

abdullahm · Answer

They gave you the r most likely because there are other questions that will have to do with r

sammyalabamy · Answer

This is the final question and i am still lost. I did the (a1*a2)+(b1*b2)+(c1*c2) but what do i do after?

nincompoop · Answer

perhaps, read this so you're not just mechanically performing dot product without knowing what you're doing http://physics.info/vector-multiplication/

sammyalabamy · Answer

so do i do r+(v*w) or r*(v*w)

abdullahm · Answer

They only want the dot product of v and w

nincompoop · Answer

have you learnt about matrices before?

sammyalabamy · Answer

no i dont think so

kainui · Answer

The r vector is a red herring. Don't let it distract you, v ⋅ w does in no way depend on r at all since v and w are completely independent of r.