Question #289734

find the minimal polynomial of the linear operator t : R³ "- R³" define by t (x,y,z) =(x+2y+3z, 4y+5z,6 z).is t




1
Expert's answer
2022-02-07T13:58:06-0500

(X+2y+3z4y+5z6z)\begin{pmatrix} X+2y+3z \\ 4y+5z\\ 6z \end{pmatrix} =x(100)+y(240)+z(356)=x\begin{pmatrix} 1\\ 0\\ 0 \end{pmatrix}+y\begin{pmatrix} 2\\ 4 \\ 0 \end{pmatrix}+z \begin{pmatrix} 3 \\ 5 \\ 6 \end{pmatrix}



Transforming matrix

A=(123045006)A=\begin{pmatrix} 1&2&3 \\ 0&4&5\\ 0&0&6 \end{pmatrix}


Characteristic equation of A is

AIλ=1λ2304λ5006λ=0\>\>\begin{vmatrix} A-I\lambda \\ \end{vmatrix}=\begin{vmatrix} 1-\lambda&&2&&3 \\ 0&&4-\lambda&&5 \\ 0&&0&&6-\lambda \end{vmatrix}=0


Expanding

(1λ)[(4λ)(6λ)0]+2(0)+3(0)=0(1-\lambda)[(4-\lambda)(6-\lambda)-0]+2(0)+3(0)=0


    (1λ)(4λ)(6λ)=0\implies(1-\lambda)(4-\lambda)(6-\lambda)=0


The distincts roots of A are also roots of the minimum polynomial g(x)g(x)


g(x)=(x1)(x4)(x6)\therefore\>g(x)=(x-1)(x-4)(x-6)




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