Explanation
The values of the vectors are shown below
Thus
[tex]\begin{gathered} u=(6,5) \\ v=(-6,-10) \end{gathered}[/tex]
Thus to get -3(u.v) will be
[tex]\begin{gathered} step\text{ 1} \\ find\text{ the dot product} \\ u.v=6(-6)+5(-10) \\ u.v=-36-50 \\ u.v=-86 \end{gathered}[/tex]
The next step will be
[tex]\begin{gathered} -3(u.v)=-3\times-86=258 \\ \\ -3(u.v)=258 \end{gathered}[/tex]
The answer will be
