Question

HELP FAST PLEASE Find u*v, if u=13j and v=i+3j

Answer 1

$\bf \begin{cases} u=13j\implies 0i+13j\implies \ \textless \ 0,13\ \textgreater \ \\ v=i+3j\implies 1i+3j\implies \ \textless \ 1,3\ \textgreater \ \end{cases} \\\\\\ \ \textless \ 0,13\ \textgreater \ \cdot \ \textless \ 1,3\ \textgreater \ \implies (0\cdot 1)+(13\cdot 3)\implies 39$