2 akar 50 dikurangi akar 72 + 3 akar 98 =

2√50 - √72 + 3√98
= 2√25×2 - √36×2 + 3√49×2
= 2×5√2 - 6√2 + 3×7√2
= 10√2 - 6√2 + 21√2
= 25√2

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