If A=(-8,9) and B=(4,4), using the formula for distance between two points, we get:
[tex]\begin{gathered} d(A,B)=\sqrt[]{(x_2-x_1)^2+(y_2-y_1)^2} \\ \Rightarrow d(A,B)=\sqrt[]{(4-(-8))^2+(4-9)^2}=\sqrt[]{(12)^2+(-5)^2} \\ \Rightarrow d(A,B)=\sqrt[]{144+25}=\sqrt[]{169}=13 \\ d(A,B)=13 \end{gathered}[/tex]Therefore, the distance between A and B is 13 units
Formula for distance between two points:
[tex]d(A,B)=\sqrt[]{(x_2-x_1)^2+(y_2-y_1)^2}[/tex]
