191k views
4 votes
Find the indicated vector

Find the indicated vector-example-1

1 Answer

2 votes

Answer:

(d) 5i -j

Explanation:

You want the value of the expression 2u -v where u=3i and v=i+j.

Substitution

Use the given definitions of u and v, and simplify in the usual way.

2u -v = 2(3i) -(i+j)

= 6i -i -j . . . . . . . . . eliminate parentheses

= 5i -j

__

Additional comment

The unit vectors i and j can be treated as though they were variables. The usual properties of equality and (scalar) arithmetic apply.

Find the indicated vector-example-1
User Ruudvan
by
8.3k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories