Let tr(X) and adj(X) denote the trace and adjoint of a square matrix X – InterviewSolution

1.	Let tr(X) and adj(X) denote the trace and adjoint of a square matrix X. If M is a non-singular square matrix of order 3 such that M−1=⎡⎢⎣345453534⎤⎥⎦, then the value of \|15tr(adj(M))\| is
Answer» Let $t r (X)$ and $a d j (X)$ denote the trace and adjoint of a square matrix $X .$ If $M$ is a non-singular square matrix of order $3$ such that $M^{- 1} = ⎡ ⎢ ⎣ \begin{matrix} 3 & 4 & 5 4 & 5 & 3 5 & 3 & 4 \end{matrix} ⎤ ⎥ ⎦,$ then the value of $\| 15 t r (a d j (M)) \|$ is

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