## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

$x=11$ or $x=-11$
$x^{2}=121\qquad$... use the principle of square roots: For any real number $k$ , if $x^{2}=k$ , then $x=\sqrt{k}$ or $x=-\sqrt{k}$ $x=\pm 11\qquad$... the symbol $\pm$ indicates two solutions. $x=11$ or $x=-11$