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It is 7 + 3 root 5.
Simply change the sign of one of the two terms. Thus -7 - 3 root 5 (changing the sign of the first term) is also a rationalisation factor. The only reason to go for the other one is that there will be fewer negative signs to deal with. The answer will be the same.
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Earn +20 ptsQ: What is the rationalisation factor 7 - 3 root 5?
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