Question

Find the inner product for (3, 1, 4) x (2, 8, -2) and state whether the vectors are perpendicular.

a. 6; no
b. 6; yes
c. 3; no
d. 3; yes

Answer 1

The person over there is correct, it is A.

Explanation:

I take the practice.

Answer 2

a. 6; no

Explanation:

(3, 1, 4)·(2, 8, -2) = (3)(2) +(1)(8) +(4)(-2) = 6

The result is non-zero, so the vectors are NOT perpendicular.