1. The fourth root is a mathematical concept that refers to the fact that the fourth root of a number a is another number b, such that b⁴=a.

(2) Negative numbers: Negative numbers also have four power roots, but they are complex numbers. For example, the fourth power root of -16 is 2i and -2i because (2i)⁴ = -16;

(4) Symbol: The fourth power root of a positive number is a positive number, and the fourth power root of a negative number is a complex number.

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