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4 + √2
= 4 - √2 x 4 - √2
4 + √2 4 - √2
= 16 -4√2 -4√2 + 2
16 -4√2 + 4√2 -2
= 18 - 8√2
14
= 9 - 4√2
7
semoga membantu,
jadikan jawaban terbaik ya