53 9 If A = 1 8 07 54 – 2 and B = 7...
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53 9 If A = 1 8 07 54 – 2 and B = 7 2 0 1 2 27 4 , then find the matrix B'A'. 6

11th - 12th Class
Maths
Solution
76
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Sol' ( A=left[begin{array}{lll}3 & 9 & 0 1 & 8 & -2 7 & 5 & 4end{array}right] & B=left[begin{array}{lll}4 & 0 & 2 7 & 1 & 4 2 & 2 & 6end{array}right] ) ( A B=left[begin{array}{rrr}3 & 9 & 0 1 & 8 & -2 7 & 5 & 4end{array}right]left[begin{array}{rrr}4 & 0 & 2 7 & 1 & 4 2 & 2 & 6end{array}right] ) ( A B=left[begin{array}{lll}75 & 9 & 42 56 & 4 & 22 71 & 13 & 58end{array}right] ) ( Rightarrow(A B)^{prime}=left[begin{array}{ccc}75 & 56 & 71 9 & 4 & 13 42 & 22 & 58end{array}right] ) ( left(because(hat{A B})^{prime}=B^{prime} A^{prime}right) ) (1) Hence ( B^{prime} A^{prime}=left[begin{array}{ccc}15 & 56 & 71 9 & 4 & 13 42 & 22 & 58end{array}right] )
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