Find u · v u = i − 8j v = −2i + j

Question

u = i − 8j

v = −2i+ j

Answer 1

Hi there,

To find the dot product in this case, you simply multiply the x, y, and z components (in this case there are no z (k) components) with each other and sum them.

(1*-2)+(-8*1)= -10.

* The other case would be to multiply the magnitudes of the u and v vectors along with the cosine of the angle in between the vectors (which was not given here).

I hope this helps.