document.write( "Question 1017168: Please help! 1) Find the inverse of the matrix [ -9 5 6 -3 ]
\n" ); document.write( "2) solve the following equation
\n" ); document.write( " | 0 0 -1 |
\n" ); document.write( " | 3 x 0 | =x^2
\n" ); document.write( " | 2 0 3 | \n" ); document.write( "

Algebra.Com's Answer #633514 by ikleyn(52835) $\"\"$ $\"About$

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\n" ); document.write( "Please help! 1) Find the inverse of the matrix [ -9 5 6 -3 ]
\n" ); document.write( "2) solve the following equation
\n" ); document.write( " | 0 0 -1 |
\n" ); document.write( " | 3 x 0 | =x^2
\n" ); document.write( " | 2 0 3 |
\n" ); document.write( "-----------------------------------------------------\r
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\n" ); document.write( "\n" ); document.write( "

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document.write( "Co-factor the determinant along the first row.\r\n" );
document.write( "(see the lesson Co-factoring the determinant of a 3x3 matrix in this site to learn how to do it).\r\n" );
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document.write( "Then the determinant is (-1)*det = (-1)*(-2x) = 2x.\r\n" );
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document.write( "So your equation is \r\n" );
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document.write( " = ,\r\n" );
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document.write( "and its roots are  x=0  and/or  x = 1.\r\n" );
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\r
\n" ); document.write( "\n" ); document.write( "Regarding your first question, do you know that only square matrices have the inverse?\r
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