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Verified answer
Bab Bilangan IrrasionalMatematika SMP Kelas IX
(5√3 + 4√2) (2√3 - 3√2) = (5√3 . 2√3) - (5√3 . 3√2) + (4√2 . 2√3) - (4√2 . 3√2)
= (10 . 3) - (15 √(3 x 2)) + (8 √(3 x 2)) - (12 . 2)
= 30 - 15√6 + 8√6 - 24
= 6 - 7√6