Question

Let u = <-7, -2>. Find 4u.

a. <-28, -8>
b. <-28, 8>
c. <28, -8>
d. <28, 8>

Answer 1

The answer is <-28 or >8

Answer 2

a. <-28, -8>

Explanation:

The given vector is

u = <-7, -2>.

To find 4u, we multiply the given vector by the scalar 4.

4u =4 <-7, -2>.

4u =<-7\times4, -2\times4>.

We multiply out to get;

4u =<-28, -8>.

The correct choice is a. <-28, -8>