Answer:
The answer to this question is: B [-2√5]
Explanation:
First, Find both numbers that can accommodate with each of the radicals.
√20
10 and 2
5 and 2 and 2
√80
10 and 8
5 and 2 and 4 and 2
5 and 2 and 2 and 2 and 2
After this is what they'll look like.
√5,2,2 - √5,2,2,2,2
Group numbers of pairs
√5,2,2 - √5,2,2,2,2
For every pair, bring out the #'s, but only one survives, and comes out.
2√5 - 4√5
= -2√5
This is your answer! Hope this helped!