AP EAMCET · Maths · Matrices
If \(A=\left[\begin{array}{lll}1 & 1 & 3 \\ 1 & 7 & 9 \\ 2 & 3 & 7\end{array}\right]\) then \(\operatorname{Tr}\left(A^2-A\right)=\)
- A 0
- B -12
- C 152
- D 125
Answer & Solution
Correct Answer
(C) 152
Step-by-step Solution
Detailed explanation
Given \(A=\left[\begin{array}{lll}1 & 1 & 3 \\ 1 & 7 & 9 \\ 2 & 3 & 7\end{array}\right]\) \[ \text { Now }\left(\mathrm{A}^2-\mathrm{A}\right)=\mathrm{A}(\mathrm{A}-\mathrm{I}) \]…
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