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(√5 - √2)(√2 + √5)²
(√5 - √2)((√2)² + 2.√2.√5 + (√5)²)
(√5 - √2)(2 + 2√10 + 5)
(√5 - √2)(7 + 2√10)
7√5 + 2√50 - 7√2 - 2√20
7√5 + 2√(25x2) - 7√2 - 2√(4x5)
7√5 + 10√2 - 7√2 - 4√5
3√5 + 3√2
↔ ( √5 - √2 ) ( √2² + 2(√2)(√5) + √5² )
↔ ( √5 - √2 ) ( 2 + 2√10 + 5 )
↔ ( √5 - √2 ) ( 7 + 2√10 )
↔ 7√5 + 2√50 - 7√2 - 2√20
↔ 7√5 + 2√( 5² × 2 ) - 7√2 - 2√( 2² × 5 )
↔ 7√5 + ( 2 × 5 )√2 - 7√2 - ( 2 × 2 )√5
↔ 7√5 + 10√2 - 7√2 - 4√5
→ 3√2 + 3√5