csat-suneung 2009 Q2

csat-suneung · South-Korea · csat__math-humanities 2 marks Matrices Matrix Algebra and Product Properties

For two matrices $A = \left( \begin{array} { l l } 2 & 1 \\ 1 & 1 \end{array} \right) , B = \left( \begin{array} { r r } - 1 & - 2 \\ 1 & 0 \end{array} \right)$, what is the sum of all components of the matrix $( A + B ) A$? [2 points]
(1) 9
(2) 10
(3) 11
(4) 12
(5) 13

For two matrices $A = \left( \begin{array} { l l } 2 & 1 \\ 1 & 1 \end{array} \right) , B = \left( \begin{array} { r r } - 1 & - 2 \\ 1 & 0 \end{array} \right)$, what is the sum of all components of the matrix $( A + B ) A$? [2 points]\\
(1) 9\\
(2) 10\\
(3) 11\\
(4) 12\\
(5) 13

Paper Questions

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