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Verified answer
Bab Bilangan IrrasionalMatematika SMP Kelas IX
(√(52 + 6 √43))³ - (√(52 - 6 √43))
= (√(52 + 2 √(3² . 43))² - (√(52 - 2 √(3² . 43))
= (√43 + √3²)³ - (√43 - √3²)³
= (√43 + 3)³ - (√43 - 3)³
= (√43 + 3 - √43 + 3) ((√43 + 3)² + (√43 + 3) (√43 - 3) + (√43 - 3)²)
= 6 (43 + 6 √43 + 9 + 43 - 9 + 43 - 6 √43 + 9)
= 6 . 138
= 828