Find the dot product for u = { 3, -2} and v = {-5, 1}

Filip Bartuzi asked Jan 19, 2023

327,877 views

22 votes

Filip Bartuzi asked Jan 19, 2023

3.0k points

Your comment on this question:

Email me at this address if a comment is added after mine:Email me if a comment is added after mine

Privacy: Your email address will only be used for sending these notifications.

Email me at this address if my answer is selected or commented on:Email me if my answer is selected or commented on

Privacy: Your email address will only be used for sending these notifications.

18 votes

Answer:

Answer is -17

Explanation:

Express in vectorial form:

${ \rm{u = \binom{3}{ - 2} }} \\ \\ { \rm{v = \binom{ - 5}{1} }}$

• Then the dot product:

${ \rm{u•v = (3 * - 5) + ( - 2 * 1)}} \\ \\ { \rm{u•v = - 15 - 2}} \\ \\ { \rm{u•v = - 17}}$

3.1k points

Email me at this address if a comment is added after mine:Email me if a comment is added after mine

Privacy: Your email address will only be used for sending these notifications.

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

1.6m questions

2.0m answers