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Mathematics
Mathematics
Problem
If
A
=
[
1
−
1
2
−
1
]
A = \begin{bmatrix} 1 & -1 \\ 2 & -1 \end{bmatrix}
A
=
[
1
2
−
1
−
1
]
,
B
=
[
a
1
b
−
1
]
B = \begin{bmatrix} a & 1 \\ b & -1 \end{bmatrix}
B
=
[
a
b
1
−
1
]
and
(
A
+
B
)
2
=
A
2
+
B
2
(A+B)^2 = A^2 + B^2
(
A
+
B
)
2
=
A
2
+
B
2
, the value of
a
+
b
a+b
a
+
b
is a. 4 b. 6 c. 5 d. 7
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