(root2 + root5)²
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( √5 + √2 )²
BY USING ( a + b )^2 = a^2 + b^2 + 2ab
( √5 + √2 )²
⇒ ( √ 5 )² + ( √ 2 )² + 2( √5 × √ 2 )
⇒ 5 + 2 + 2√( 5 × 2 )
⇒ 5 + 2 + 2√10
⇒ 7 + 2√10
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