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The idea is to take out perfect squares. The largest perfect square in this case is 256, which is the square of 16 (if you have trouble figuring this out, you can take out a smaller perfect square first, and then see if you find additional perfect squares). In any case, the end result should not have a factor that is a perfect square.

Using the symbol "root()" for square root:

root(512) = root(256 x 2) = root(256) x root(2) = 16 root(2)

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Q: Simplify the square root of 512?
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