Answer
The solutions are $x=11$ or $x=-11$.
We used square root method for solving the equation because the equation is in the form $x^{2}=d$.
Work Step by Step
$x^{2}-121=0$
Adding $121$ to each side, we get
$x^{2}=121$
Taking the square root of each side, we obtain
$x=\pm \sqrt {121}$
Or $x=\pm 11$
The solutions are $x=11$ or $x=-11$.
We used square root method for solving the equation because the equation is in the form $x^{2}=d$.
