2017 AMC 8 Problem 3

Attempt Problem 3 of the 2017 AMC 8 below, then check your answer against the video solution and professionally curated solution from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 2017 AMC 8 solutions, or check the answer key.

All problems are used with official legal permission of the Mathematical Association of America (MAA).

3.

What is the value of the expression 1684?\sqrt{16\sqrt{8\sqrt{4}}}?
4 4
42 4\sqrt{2}
8 8
82 8\sqrt{2}
16 16
Answer: C
Concepts:radical
Small hint:
Start with the innermost square root.
Big hint:
After simplifying 4\sqrt{4}, the middle radical becomes easier.
Video solution:
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Written solution:
This expression can be reduced as follows: 1684=1616=64=8 \begin{align*} \sqrt{16\sqrt{8\sqrt{4}}} &= \sqrt{16\sqrt{16}} \\ &= \sqrt{64}\\ &= 8 \end{align*}
Thus, C is the correct answer.
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