Yes, if appropriate.
The base is the repeated factor, the exponent is the number of times by which the base is mutltiplied by itself. The exponent is also known as the power, althought the product of the exponential expression can also be described as the power.
x264: Without knowing the value of x you cannot evaluate this expression.
Base of a power
The 3 is the factor
Is is called the exponent.
4 to the second power
17 to the 3rd power as a product of the same factor is written 17 x 17 x 17
The power is the product between the magnitude of voltage and the magnitude of current. Whereas the power factor is a ratio between the active power and the apparent power.
To evaluate an expression means to find its numerical value. A power consists of a base and an exponent. According to the order of operations, operations inside parentheses (or other grouping symbols) are performed first, followed by the evaluation of powers ... then (*/) and (+-).