Question Number 358 by 123456 last updated on 25/Jan/15
$$\mathrm{A}=\begin{bmatrix}{{x}}&{−{y}}\\{{y}}&{{x}}\end{bmatrix} \\ $$$$\mathrm{X}=\begin{bmatrix}{{x}}\\{{y}}\end{bmatrix} \\ $$$$\mathrm{Y}=\mathrm{AX} \\ $$
Answered by prakash jain last updated on 24/Dec/14
$${AX}=\begin{bmatrix}{{x}^{\mathrm{2}} −{y}^{\mathrm{2}} }\\{\mathrm{2}{xy}}\end{bmatrix} \\ $$