MCQ
If $A =\left[\begin{array}{ll}x & 3 \\ y & 3\end{array}\right]$ and $A ^2=3 I$, where $I =\left[\begin{array}{ll}1 & 0 \\ 0 & 1\end{array}\right]$ the order of $A ^2$ is :
- A$2 \times 2$
- B$2 \times 3$
- C$1 \times 2$
- D$3 \times 2$
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Answer
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Statement (A): The matrices $A=\left[\begin{array}{rr}2 & 5 \\ 7 & -4\end{array}\right]$ and $B=\left[\begin{array}{rr}2 & 5 \\ 7 & -4\end{array}\right]$ are equal.
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