$$\frac { 1 } { 5 x ^ { - 2 } } + 5 x + 7$$
$\frac{x^{2}}{5}+5x+7$
$$\frac{1}{5x^{-2}}+\frac{\left(5x+7\right)\times 5x^{-2}}{5x^{-2}}$$
$$\frac{1+\left(5x+7\right)\times 5x^{-2}}{5x^{-2}}$$
$$\frac{1+25\times \frac{1}{x}+35x^{-2}}{5x^{-2}}$$
$$\frac{1+\left(35+25x\right)x^{-2}}{5x^{-2}}$$
$$\frac{x^{-2}\left(x-\left(-\frac{1}{2}\sqrt{485}-\frac{25}{2}\right)\right)\left(x-\left(\frac{1}{2}\sqrt{485}-\frac{25}{2}\right)\right)}{5x^{-2}}$$
$$\frac{\left(x-\left(-\frac{1}{2}\sqrt{485}-\frac{25}{2}\right)\right)\left(x-\left(\frac{1}{2}\sqrt{485}-\frac{25}{2}\right)\right)}{5}$$
$$\frac{\left(x+\frac{1}{2}\sqrt{485}+\frac{25}{2}\right)\left(x-\left(\frac{1}{2}\sqrt{485}-\frac{25}{2}\right)\right)}{5}$$
$$\frac{\left(x+\frac{1}{2}\sqrt{485}+\frac{25}{2}\right)\left(x-\frac{1}{2}\sqrt{485}+\frac{25}{2}\right)}{5}$$
$$\frac{x^{2}+25x-\frac{1}{4}\left(\sqrt{485}\right)^{2}+\frac{625}{4}}{5}$$
$$\frac{x^{2}+25x-\frac{1}{4}\times 485+\frac{625}{4}}{5}$$
$$\frac{x^{2}+25x-\frac{485}{4}+\frac{625}{4}}{5}$$
$$\frac{x^{2}+25x+35}{5}$$
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$\frac{\left(x-\frac{-\sqrt{485}-25}{2}\right)\left(x-\frac{\sqrt{485}-25}{2}\right)}{5}$
