If , where and , then…

MATHEMATICS · Single correct · CBSE · Mathematics · Matrices · Matrices

Problem

If A=[abb−a]A=\begin{bmatrix}a&b\\b&-a\end{bmatrix}, where a,b∈Ra,b\in\mathbb R and m∈Nm\in\mathbb N, then A2mA^{2m} is (a) [a2mb2mb2m−a2m]\begin{bmatrix}a^{2m}&b^{2m}\\b^{2m}&-a^{2m}\end{bmatrix} (b) (a2+b2)m[1001](a^2+b^2)^m\begin{bmatrix}1&0\\0&1\end{bmatrix} (c) (am+bm)[1001](a^m+b^m)\begin{bmatrix}1&0\\0&1\end{bmatrix} (d) (a2+b2)m−1[abb−a](a^2+b^2)^{m-1}\begin{bmatrix}a&b\\b&-a\end{bmatrix}

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