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Mathematics
Mathematics
Problem
If
A
=
[
7
0
x
0
7
0
0
0
y
]
A = \begin{bmatrix} 7 & 0 & x \\ 0 & 7 & 0 \\ 0 & 0 & y \end{bmatrix}
A
=
7
0
0
0
7
0
x
0
y
is a scalar matrix, then
y
x
y^x
y
x
is equal to (A) 0 (B) 1 (C) 7 (D)
±
7
\pm 7
±
7
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