## Elementary Algebra

$\sqrt{x^2} = x$ when x is positive. Thus, $\sqrt{x^2} = x$ for 5, 4, and 9. $\sqrt{x^2}$ never equals negative x, for a square root is never equal to a negative number. Thus, $\sqrt{x^2}$ equals the absolute value of x for negative values of x, including -3, -8, and -11.