Let $A=a_0$ be a matrix of order 3, where $a_{ij}\{x;\text{if}i=j,x\in R1;\text{if}\left|i-j\right|=1;0;otherwise$ then when of the following Hold (s) good: for$x=2$ , $A$ is a diagonal matrix $A$ is a symmetric matrix for$x=2$ , det $A$ has the value equal to 6 Let $f\left(x\right)=$ , det $A,$ then the function $f\left(x\right)$ has both the maxima and minima.

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