Question

Let u, v and w be the vectors such that u + v + w = 0. If |u| = 3, |v| = 4, |w| = 5, the value of u.v + v.w + w.u is

(a) 47

(b) – 25

(c) 0

(d) 25

Answer 1

Answer is (b) -25

Explanation:

Given,