Question 1202b

Vectors I: Basics, Dot and Cross Products

Perpendicular Vectors

Question

Given that the vectors

{\begin{pmatrix} 1 \\ - 3 \\ 1 \end{pmatrix}}

and

{\begin{pmatrix}p\\1\\2\end{pmatrix}}

are perpendicular, what is the value of

{p?}

{p= }