$$\frac{ -1 }{ 11 } + \frac{ { y }^{ 2 } }{ 11 }$$
$\frac{y^{2}-1}{11}$
$$-\frac{1}{11}+\frac{y^{2}}{11}$$
$$\frac{-1+y^{2}}{11}$$
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$\frac{\left(y-1\right)\left(y+1\right)}{11}$
$$\left(y-1\right)\left(y+1\right)$$
$$\frac{\left(y-1\right)\left(y+1\right)}{11}$$
