Solve for $\displaystyle {x}$.

$\displaystyle {16}{x}-{147}={\left({x}+{4}\right)}^{{2}}$
$\displaystyle {x}=$ (Separate answers by a comma.)

If the answer is radical use sqrt(5) to denote $\displaystyle \sqrt{{{5}}}$ (use the correct radicand in the problem!)
If the answer is complex use i to denote $\displaystyle {i}$.