$${ x }^{ 2 } -20 \times { 10 }^{ -6 } x+0.075 \times { 10 }^{ -9 }$$
$x^{2}-\frac{x}{50000}+0.000000000075$
$$x^{2}-20\times \frac{1}{1000000}x+0.075\times 10^{-9}$$
$$x^{2}-\frac{1}{50000}x+0.075\times 10^{-9}$$
$$x^{2}-\frac{1}{50000}x+0.075\times \frac{1}{1000000000}$$
$$x^{2}-\frac{1}{50000}x+\frac{3}{40000000000}$$
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$\frac{\left(200000x-3\right)\left(200000x-1\right)}{40000000000}$