The expression is 2A + 4B.
The given matrices are
(Simplify)
(Add corresponding entries)
The solution is .
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=39a69131686093a88509c74fa8fedb7d.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=270ddc5e5cdfaf64606db6eb0ecf3f51.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=fe67534c76311cf31992939a73e29ab0.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=94ec7846ff3350fdcacb399f24b0a763.png\")
(Simplify)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=e3a138a0be1b2ae9ddebe34fb8326fad.png\")
(Add corresponding entries)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=36ed839a55df5c44e4dadbfd713a4c35.png\")
(Simplify) ![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=36ed839a55df5c44e4dadbfd713a4c35.png\")
.