It's question no.3 which is provided in the image.
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=5/20^1/2 -10^1/2
=5 (20^1/2 +10^1/2)/(20^1/2 -10^1/2)(20^1/2 +10^1/2)
=5(20^1/2 -10^1/2)/(20-10)
=5(20^1/2 -10^1/2)/10
=(20^1/2 -10^1/2)/2
=(10^1/2 -5^1/2)/2^1/2
=(3.2-2.2)/2^1/2
=1/2^1/2
=2^(-1/2)
you can also simplify this
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