Question

Given the vector a=[-4.1,7], b=[2,0,-3], and c=[1,-1,5], simplify b*(a+c).
Cartesian Vectors of a Vectors Unit.

Answer 1

My answer is [-6,0,-36]

Answer 2

Correct answer is -42.

Answer 3

so, its b dot (a+c)?

Answer 4

Yes.

Answer 5

a + c = [-3, 0, 12]

Answer 6

[-3, 0, 12] dot [2, 0, -3] = -3(2) + 0(0) + -3(12) = -42

Answer 7

So I only add at the very end right?

Answer 8

Thanks.

Answer 9

add a and b first, then take the dot product with c