Multiply $\frac{1}{50000000000000}$ and $4.5$ to get $\frac{9}{100000000000000}$.
$$\sqrt{900000000|\frac{9}{100000000000000}|}$$
The absolute value of a real number $a$ is $a$ when $a\geq 0$, or $-a$ when $a<0$. The absolute value of $\frac{9}{100000000000000}$ is $\frac{9}{100000000000000}$.
Multiply $900000000$ and $\frac{9}{100000000000000}$ to get $\frac{81}{1000000}$.
$$\sqrt{\frac{81}{1000000}}$$
Rewrite the square root of the division $\frac{81}{1000000}$ as the division of square roots $\frac{\sqrt{81}}{\sqrt{1000000}}$. Take the square root of both numerator and denominator.
