Question

Which of the following sums would be under the radical symbol to find the distance between the points (7, -1) and (-8, -9)?


1^2 + 10^2

1^2 + 8^2

15^2 + 8^2

Answer 1

distance formula : d = sq rt ((x2 - x1)^2 + (y2 - y1)^2)
(7,-1)....x1 = 7 and y1 = -1
(-8,-9)..x2 = -8 and y2 = -9
now we sub
d = sq rt ((-8 - 7)^2 + (-9 - (-1)^2))
d = sq rt ((-15^2) + (-8^2)) ---- I am not getting exactly the same thing

Answer 2

Thank you!!