help me please i got the answer which is 2 but how do i do the sqrt 3 part in the bottom in gold letters

[tex] |MN| =\sqrt{(x_{M}-x_{N})^{2}+(y_{M} - y_{N})^{2}} =\sqrt{(-6-(-1))^{2}+(-1-(-7))^{2}} =
\\ \\ =\sqrt{25 +36} =\sqrt{61}
\\ \\Answer \ is \ \sqrt{61} . [/tex]