Calculate: x^2+16=0

Expression: $x^{2}+16=0$

Simplify

$x^{2}=-16$

Subtract $16$ from both sides

$x^{2}+16-16=0-16$ $x=\sqrt{-16},x=-\sqrt{-16}$

$\sqrt{-16}=4i$

$x=4i,x=-4i$