Question

Halp!

Answer 1

Problem.

Answer 2

D=169

Answer 3

Do you want to see how to work it?!

Answer 4

hmmm you're given the distance formula, so...hmmm use it :)

notice \(\bf \textit{distance between 2 points}\\ \quad \\
\begin{array}{lllll}
&x_1&y_1&x_2&y_2\\
% (a,b)
&({\color{red}{ 4}}\quad ,&{\color{blue}{ 7}})\quad
% (c,d)
&({\color{red}{ -1}}\quad ,&{\color{blue}{ -5}})
\end{array}\qquad
% distance value
d = \sqrt{({\color{red}{ x_2}}-{\color{red}{ x_1}})^2 + ({\color{blue}{ y_2}}-{\color{blue}{ y_1}})^2}\)