Question

could u pls solve this question
I will definitely mark as brainiest if is good explanation​

Answer 1

Answer:

I think the answer is 2√21

Answer 2

Answer:

Option 3

Step-by-step explanation:

x=root(5+root21)

x^2=5+root21

y=root(5-root21)

y^2=5-root21

(x-y)^2=x^2-2xy+y^2

=5+root21-2(root(5+root21))(root(5-root21))+5-root21

=5+5+root21-root21-2(root(5^2-root21^2)

=10-2(root(4))

=10-2(2)

=10-4

=6

Therefore x-y=root6

Plz mark mine as brainliest