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If is a matrix satisfying
MATHEMATICS · Subjective · CBSE · Mathematics · Matrices · Matrices
Problem
If
A
=
[
1
2
2
2
1
−
2
a
2
b
]
A=\begin{bmatrix}1&2&2\\2&1&-2\\a&2&b\end{bmatrix}
A
=
1
2
a
2
1
2
2
−
2
b
is a matrix satisfying
A
A
′
=
9
I
3
AA'=9I_3
A
A
′
=
9
I
3
, find the value of
∣
a
∣
+
∣
b
∣
|a|+|b|
∣
a
∣
+
∣
b
∣
.
Related theory
Matrix Operations
Matrices
Properties of matrix operations
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