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4
It is called the fourth root, and is denoted x1/4 or x0.25 (as opposed to x1/2 and x0.5 for square roots). It can also be denoted 4√x. A square root of a square root is the fourth root of a number.
To find the fourth root of 512, you can raise 512 to the power of 1/4. This is equivalent to finding the number that, when raised to the fourth power, equals 512. So, the fourth root of 512 is equal to 512^(1/4), which simplifies to 4. Therefore, the fourth root of 512 is 4.
a fourth root of 0.04
Take the square root of the square root of the number (that is the fourth root of the number), for example: √√16 = √(√16) = √4 = 2 24 = 16 ⇒ 2 is the fourth root of 16.