document.write( "Question 1102637: $\"A\"$ matrix $\"A\"$ is called an involutory matrix if $\"A%5E2=+I\"$ . Prove that for any involutory matrix $\"A\"$ , $\"+A=%2B1\"$ , $\"-1\"$ \n" ); document.write( "

Algebra.Com's Answer #717367 by rothauserc(4718) $\"\"$ $\"About$

You can put this solution on YOUR website!
try A =
\n" ); document.write( ":
\n" ); document.write( "|0 1|
\n" ); document.write( "|1 0|
\n" ); document.write( ":
\n" ); document.write( "A^2 = I but A does not equal I or -I
\n" ); document.write( ":\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

\n" );