If x = √5 + 2, find x²-4√5.

2025

Answer: C. 9 — x = sqrt(5) + 2, so x^2 = 5 + 4 + 4sqrt(5) = 9 + 4sqrt(5). Hence x^2 - 4sqrt(5) = 9.

1. A.

   1

2. B.

   7

3. C.

   9

4. D.

   3

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