$$1- \frac{ { a }^{ 2 } }{ 25 }$$
$-\frac{a^{2}}{25}+1$
$$\frac{25}{25}-\frac{a^{2}}{25}$$
$$\frac{25-a^{2}}{25}$$
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$\frac{\left(-a-5\right)\left(a-5\right)}{25}$
$$\left(5-a\right)\left(5+a\right)$$
$$\left(-a+5\right)\left(a+5\right)$$
$$\frac{\left(-a+5\right)\left(a+5\right)}{25}$$
