\
Multiply the matrix by
.
\
\
\
Simplify
\
\
The solution is
.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
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.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=2072844855f639814bb5c6ae47eff468.png\")
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![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step2.JPG\")
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![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
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.