x to the power of 4 means that the variable x is multiplied by itself four times. It is written mathematically as x4 or x × x × x × x.
For example, if x equals 2, then x to the power of 4 would be:
24 = 2 × 2 × 2 × 2 = 16.
This concept is part of the broader topic of exponents, which are used to simplify the expression of repeated multiplication. The power or exponent tells us how many times to use the base (in this case, x) in a multiplication.