Verified Answer :

Nirina7

let A = 2 radical 50- 3 radical 8 
 radical 50 = sqrt( 2 25 ) = 5sqrt( 2 )
 radical 8  = sqrt(24) = 2 sqrt(2)
so 
A = 2 radical 50- 3 radical 8 = 10sqrt( 2 ) - 6sqrt( 2 ) = 4sqrt( 2 )
finally 

A = 4sqrt( 2 )

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