Algebra
if A=(1 3
2 1),then find the determinant of A2 -2a is
if A=(1 3
2 1),then find the determinant of A2 -2a is
1 Answer
ramya ramanathan
A^2 = (7 6
4 7)
-2A = (-2 -6
-4 -2)
A^2-2A = (5 0
0 5)
|A^2-2A| = 25
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