Solución
(
2
i
×
3
j
)
×
j
=
2
(
i
×
3
j
)
×
j
=
2
(
3
)
(
i
×
j
)
×
j
=
(
6
k
)
×
j
=
6
(
−
i
)
=
−
6
i
\begin{aligned} (2\bold{i}\times 3\bold{j})\times \bold{j} &= 2(\bold{i}\times 3\bold{j})\times\bold{j}\\ &= 2(3)(\bold{i}\times\bold{j})\times\bold{j}\\ &= (6\bold{k})\times\bold{j}\\ &= 6(−\bold{i})=−6\bold{i} \end{aligned}
(
2
i
×
3
j
)
×
j
=
2
(
i
×
3
j
)
×
j
=
2
(
3
)
(
i
×
j
)
×
j
=
(
6
k
)
×
j
=
6
(
−
i
)
=
−
6
i