Answer:
2√5
Explanation:
(1/2) √80
Figure out the biggest number that can be squared by 80 in this case it's 16
(1/2) √(16 x 5)
since the square root of 16 is 4 put the 4 on the outside and leave 5 in since it can't be squared.
(1/2) 4√5
multiply (1/2) by 4 which equals 2
2√5
I hope this helps!