Incorrect. You can find the distance between the points (1, 2) and (5, -1) by inserting the values for x and y into the formula: $\displaystyle\sqrt{{{{\left({x}_{{1}}-{x}_{{2}}\right)}}^{{2}}+{{\left({y}_{{1}}-{y}_{{2}}\right)}}^{{2}}}}=\sqrt{{{{\left({1}-{5}\right)}}^{{2}}+{{\left({2}-{\left(-{1}\right)}\right)}}^{{2}}}}\usepackage{cmbright}\Huge\$ . Now that you know what is under the radical, can you find the distance?