To factor the expression over the complex numbers, let's fin its roots, then we will be able to write it in the generic form of a factored polynomial as follows:

Where a and b stand for the roots of the polynomial.
![\begin{gathered} x^2+50=0\to x^2=-50 \\ \to x_(1,2)=\pm\sqrt[]{-50} \\ x_1=i\sqrt[]{50} \\ x_2=-i\sqrt[]{50} \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/u4kklvfibkkvwdysk03xh8jr6fzz3jiljs.png)
From this, we can rewrite the polynomial as follows:
![x^2+50=(x+i\sqrt[]{50})(x-i\sqrt[]{50})](https://img.qammunity.org/2023/formulas/mathematics/college/q9mvi65ygukqcxmwub19q067c3zk8ru1ed.png)