Prove that the root 10{(root10+1)-(root 10 -1)} is a whole number
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10{(√10+1)( √10-1)}
= 10(√10^2-1^2)
= 10(10-1)
=10*9
= 90
Therefore 10{(root10+1)(root 10 -1)}is a whole number (proved)
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