Question

Which of the following is(are) NOT the square of a 3 x 3 matrix with real entries ?
[A] $\left[\begin{array}{ccc}1&0&0\\0&1&0\\0&0&-1\end{array}\right]$
[B] $\left[\begin{array}{ccc}-1&0&0\\0&-1&0\\0&0&-1\end{array}\right]$
[C] $\left[\begin{array}{ccc}1&0&0\\0&1&0\\0&0&1\end{array}\right]$
[D] $\left[\begin{array}{ccc}1&0&0\\0&-1&0\\0&0&-1\end{array}\right]$

Answer 1

Answer:

the answer is D i think so...

Answer 2

Answer:

sorry...don't know the answer

Explanation:

sorry