[tex]~~~~~~~~~~~~\textit{distance between 2 points} \\\\ (\stackrel{x_1}{-1}~,~\stackrel{y_1}{0})\qquad (\stackrel{x_2}{8}~,~\stackrel{y_2}{-5})\qquad \qquad d = \sqrt{( x_2- x_1)^2 + ( y_2- y_1)^2} \\\\\\ d=\sqrt{[8 - (-1)]^2 + [-5 - 0]^2}\implies d = \sqrt{(8+1)^2+(-5)^2} \\\\\\ d = \sqrt{81+25}\implies d = \sqrt{106}[/tex]
