$$\frac{(x-1)^{-2}}{(x+1)^{-2}}; x=2$$
$y=36$
$$y=4\times \frac{\left(2-1\right)^{-2}}{\left(2+1\right)^{-2}}$$
$$y=4\times \frac{1^{-2}}{\left(2+1\right)^{-2}}$$
$$y=4\times \frac{1}{\left(2+1\right)^{-2}}$$
$$y=4\times \frac{1}{3^{-2}}$$
$$y=4\times \frac{1}{\frac{1}{9}}$$
$$y=4\times 1\times 9$$
$$y=4\times 9$$
$$y=36$$
$$x=2$$ $$y=36$$
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