Mathematics II20785 marksNumerical: matrix power formulaDiagonalization
If A=beginbmatrix 7 & 2 -4 & 1 endbmatrix, find a formula for An, where A = PDP-1, P=beginbmatrix 1 & 1 -1 & -2 endbmatrix and D=beginbmatrix 5 & 0 0 & 3 endbmatrix
If $A=\begin{bmatrix} 7 & 2 \ -4 & 1 \end{bmatrix}$, find a formula for $A^n$, where $A = PDP^{-1}$, $P=\begin{bmatrix} 1 & 1 \ -1 & -2 \end{bmatrix}$ and $D=\begin{bmatrix} 5 & 0 \ 0 & 3 \end{bmatrix}$ [5]
Given data: $$A = \begin{bmatrix} 7 & 2 \ -4 & 1 \end{bmatrix}, \quad P = \begin{bmatrix} 1 & 1 \ -1 & -2 \end{bmatrix}, \quad D = \begin{bmatrix} 5 & 0 \ 0 & 3 \end{bmatrix}$$ Relation: $A = PDP^{-1}$. Required: formula for $A^n$. Key fact: $A^n = (PDP^{-1})^n = PD^nP^{-1}$. Find $P^{-1}$: $$...