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7(1+√2) (1-√2) per 3+√2 =
(7+ 7√2) (1-√2) per 3+√2 =
7-7√2+7√2-7.2 per 3+√2 =
7-14 per 3+√2 =
-7 per 3+√2
dikalikan penyebut sekawan:
-7 per 3+√2 x 3-√2 per 3-√2 =
-21 + 7√2 per 9-2 =
-21 + 7√2 per 7 = (dibagi 7)
-3 +√2 per 1 atau
-3 +√2
= ------------------------------------ = -----------
3 + √2 3 - √2
-7 3 - √2
= -------------- = ------------
3 + √2 3 - √2
-21 + 7√2
= --------------------
9-2
-21 + 7 √2
= ----------------
7
= -3 + √2
jadi jawabannya yaitu (B) -3 + √2