Solve each equation. 7x^2+84=0 x= square

Rearrange the equality<br />$7{x}^{2}=0-84$ <br />Simpify<br />$7{x}^{2}=-84$ <br />Divive both sides by $7$ <br />$x^2=-12$ <br />As $x^2\ge 0$,$-12<0$,there is no solution for$x$ in real numbers.<br />$x\in \emptyset$ <br />