$$\frac { 25 } { x ^ { 2 } } - \frac { 1 } { 9 }$$
$-\frac{1}{9}+\frac{25}{x^{2}}$
$$\frac{25\times 9}{9x^{2}}-\frac{x^{2}}{9x^{2}}$$
$$\frac{25\times 9-x^{2}}{9x^{2}}$$
$$\frac{225-x^{2}}{9x^{2}}$$
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$-\frac{\frac{1}{9}\left(x-15\right)\left(x+15\right)}{x^{2}}$
