## Elementary Geometry for College Students (6th Edition)

$\sqrt 80$ units
(-4,1) and (4,5) To find the distance between the two points we need to use the distance formula $\sqrt (x2-x1)^{2} + (y2-y1)^{2}$ $\sqrt (4+4)^{2} + (5-1)^{2}$ $\sqrt (8)^{2} + 4^{2}$ = $\sqrt 80$ units