If A = [ 1 4 ]
If A =
[ 1 4 ]
[ 3 5 ]
and B =
[ 3 2 ]
[ 2 1 ]
then the matrix for 2A − 3B is ________.
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Correct answer: (A) [ −7 2 ] [ 0 7 ]
Explanation
2A = [2 8; 6 10] and 3B = [9 6; 6 3], so 2A − 3B = [2−9 8−6; 6−6 10−3] = [−7 2; 0 7].