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Mathematics
Mathematics
Problem
For the matrix
A
=
(
a
b
c
d
)
A = \begin{pmatrix} a & b \\ c & d \end{pmatrix}
A
=
(
a
c
b
d
)
, under which of the following conditions is
A
A
A
singular? a)
a
d
+
b
c
=
0
ad + bc = 0
a
d
+
b
c
=
0
b)
a
+
d
=
0
a + d = 0
a
+
d
=
0
c)
a
d
−
b
c
=
0
ad - bc = 0
a
d
−
b
c
=
0
d)
a
b
+
c
d
=
0
ab + cd = 0
ab
+
c
d
=
0
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