If A= [ array ccc 2 & -2 & -4 -1 & 3 & 4 1 & -2 & x array ] is an idempotent matrix then…
Mathematics · JEE Main · NTA Exams — Matrices and Determinants
If \[A=\left[\begin{array}{ccc}
2 & -2 & -4 \\
-1 & 3 & 4 \\
1 & -2 & x
\end{array}\right]\] is an idempotent matrix then \(\mathbf{x}\) is :
- -5
- -1
- -3
- -4
Answer
(C) -3
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