Answer
$0$
Work Step by Step
Since $\textbf {u}=\langle 1,1 \rangle$ and $\textbf {v}=\langle 1,-1 \rangle$,
${\textbf {u}\cdot\textbf {v}}=1(1)+1(-1)=1-1=0$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.