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2(7 + √2)(7 - √2)
2(49 - 7√2 + 7√2 - 2)
2(49 -2)
2(47)
94
ab = (7 + √2)(7 - √2)
= 49 - 7√2 + 7√2 - 2
= 47
Cari nilai 2ab
= 2 x 47
= 94
semogamembantu:)