Trigonometry 7th Edition

$\sqrt {20}$ or 4.47 unit
To calculate distance between given points (3,-2) and (-1,-4), we will use distance formula- r = $\sqrt { (x_{2} - x_{1}) ^{2} + (y_{2} - y_{1}) ^{2}}$ = $\sqrt { (-1 - 3) ^{2} + (-4 - (-2)) ^{2}}$ = $\sqrt { (-1 - 3) ^{2} + (-4 +2) ^{2}}$ = $\sqrt { (-4) ^{2} + (-2) ^{2}}$ = $\sqrt {16 +4}$ = $\sqrt {20}$ = 4.47 unit