## Geometry: Common Core (15th Edition)

The distance formula is: $\sqrt {(x_{2}-x_{1})^{2}+ (y_{2}-y_{1})^{2}}$ As the coordinates are (1,5) and (3,8), the distance formula should have looked like this: $\sqrt {(3-1)^{2}+ (8-5)^{2}}$ As can be seen, this person did not put their x and y values in the correct spot.