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Mathematics
Mathematics
Problem
For what real value of
k
k
k
is the matrix
E
=
(
k
1
2
2
k
1
1
2
k
)
E=\begin{pmatrix}k &1 &2\\2 &k &1\\1 &2 &k\end{pmatrix}
E
=
k
2
1
1
k
2
2
1
k
singular? a)
k
=
0
k=0
k
=
0
b)
k
=
3
k=3
k
=
3
c)
k
=
−
3
k=-3
k
=
−
3
d)
k
=
3
k=\sqrt{3}
k
=
3
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