4. Show that the matrix A has positive leading principal minors, where A = $$ begin{bmatrix} 2...

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4. Show that the matrix A has positive leading principal minors, where A =

$$

\begin{bmatrix}

2 & 4 & -6 \\

1 & 8 & 0 \\

1 & 4 & 1

\end{bmatrix}

$$

.

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