Calculate $126$ to the power of $5$ and get $31757969376$.
$$\sqrt{-31757969376}$$
Factor $-31757969376=\left(47628i\right)^{2}\times 14$. Rewrite the square root of the product $\sqrt{\left(47628i\right)^{2}\times 14}$ as the product of square roots $\sqrt{\left(47628i\right)^{2}}\sqrt{14}$. Take the square root of $\left(47628i\right)^{2}$.
