Question

Prove that A*I=I*A=A for all second order matrices

Answer 1

im very confused....

Answer 2

\[\left(
\begin{array}{cc}
a & b \\
c & d
\end{array}
\right).\left(
\begin{array}{cc}
1 & 0 \\
0 & 1
\end{array}
\right)\]

Answer 3

= \[\left(
\begin{array}{cc}
a & b \\
c & d
\end{array}
\right).\]

Answer 4

\[\left(
\begin{array}{cc}
1 & 0 \\
0 & 1
\end{array}
\right).\left(
\begin{array}{cc}
a & b \\
c & d
\end{array}
\right)\]= same

Answer 5

ohhh...thnx