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(√5 + √2 )²
By using ( a + b ) ²= a² + b²+ 2ab
= (√ 5 )² + (√ 2 )² + 2(√5 ×√ 2 )
= 5 + 2 + 2√( 5 × 2 )
= 5 + 2 + 2√10
= 7 + 2√10
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