- A$A^n = nA +(n-1) I$
- B$A^n =2^{n-1} A +(n-1) I$
- ✓$A^n =n A- (n-1) I$
- D$A^n =2^{n-1} A- (n-1) I$
$A^2=\left[\begin{matrix}1&0\\1&1\\\end{matrix}\right]\left[\begin{matrix}1&0\\1&1\\\end{matrix}\right]=\left [\begin{matrix}1 & 0 \\2 & 1 \\ \end{matrix}\right]$
$A^3 = A^2A = \left[\begin{matrix}1 & 0 \\2 & 1 \\ \end{matrix}\right] \left[\begin {matrix}1 & 0 \\1 & 1 \\ \end {matrix} \right]= \left[\begin{matrix}1 & 0 \\3 & 1 \\\end {matrix}\right]$
$A^n = \left[\begin{matrix}1 & 0 \\n & 1 \\ \end{matrix}\right]$
$A^n = \left[\begin{matrix}n & 0 \\n & n \\ \end{matrix}\right] \left[\begin{matrix}n-1 & 0 \\0 & n-1 \\ \end{matrix} \right]$
$A^n = n \left[\begin{matrix}1 & 0 \\1 & 1 \\ \end{matrix}\right] - (n-1) \left[\begin{matrix}1 & 0 \\0 & 1 \\ \end{matrix} \right]$
$A^n = nA - (n-1) I$
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