1. Matrix Question?

i need help
if
$

A=\begin{pmatrix}1&0&2\\0&1&0\\2&0&1\end{pmatrix}.
$

calculate B3-3B2-B+3I

the B3 and the 3B2 the 3 and the 2 are above but i dont know how to type them here

2. Originally Posted by gdilm
i need help
if
$

A=\begin{pmatrix}1&0&2\\0&1&0\\2&0&1\end{pmatrix}.
$

calculate B3-3B2-B+3I

the B3 and the 3B2 the 3 and the 2 are above but i dont know how to type them here