akar kuadrat 128-3akar kuadrat 50+4akar kuadrat 8-3akar kuadrat 18

√128 - 3√50 + 4√8 - 3√18
=√64×2 - 3√25×2 + 4√4×2 - 3√9×2
=8√2 - 3×5√2 + 4×2√2 - 3×3√2
=8√2 - 15√2 + 8√2 - 9√2
=- 8√2

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