Question

Let u = <-3, -1>. Find 7u.

a) <21, -7>
b) <21, 7>
c) <-21, 7>
d) <-21, -7>

Answer 1

(d) <-21, -7>.

Explanation:

To find 7u, we simply multiply each component of u by 7:

7u = 7<-3, -1> = <-37, -17> = <-21, -7>