For u = <3,-1> , v = <3,1>, w = <1,-2>, evaluate (4u) • v – w

Question

Find the dot product.

thank you in advance

Answer 1

u = <3,-1>, v = <3, 1>, w = <1, -2>

v - w = <2, 3>

4u = <12, -4>

4u • (v-w) = (12)(2) + (-4)(3) = 12