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2 akar 8 adalah 4 akar 2
Jadi 6 akar 2+ 4 akar 2-7 akar 2 = 3 akar 2
= √(36 x2) + 2√(4 x 2) - 7√2
= 6√2 + 4√2 - 7√2
= 3√2