Answer:
√89 (decimal: 9.43398...)
Step-by-step explanation:
Call one point Point 1 (x1,y1) and make the other Point 2 (x2,y2).
apply rule -(-a) = a
√(2 + 6)^2 + (7 - 2)^2
add the numbers: 2 + 6 = 8
√8^2 + (7 - 2)^2
subtract the numbers: 7 - 2 = 5
√8^2 + 5^2
8^2 = 64
√64 + 5^2
5^2 = 25
√64 + 25
add the numbers: 64 + 25 = 89
= √89
