akar 18 + akar 72-3 akar 32

Bab Bilangan Irrasional
Matematika SMP Kelas IX

√18 + √72 - 3 √32
= 3√2 + 6√2 - 3 x 4√2
= 9√2 - 12√2
= - 3√2

√18 = √9×2 = 3√2

√72 = √36×2 = 6√2

3√32 = 3 × √16×2 = 3 × 4√2 = 12√2

maka = (3√2) + (6√2) - (12√2) = - 3√2

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