It is a base. 3x^2 (which may look like this on a page: 3x2).
Where
x is the base
2 is the exponent
3 is the coefficient.
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base
The power could then be called an exponent. The number that is being raised to a power is called the base. In the case of 42, the exponent is 2 and the base is 4.
a quantity representing the power to which a given number or expression is to be raised, usually expressed as a raised symbol beside the number or expression
multiterm mathematical expression: a mathematical expression consisting of the sum of a number of terms, each of which contains a constant and variables raised to a positive integral power
In the expression 16x^4, the variable x is being raised to the fourth power. This means that x is being multiplied by itself four times. The value of x in this expression is unknown and could be any real number. The expression represents 16 times x raised to the fourth power.
An exponent is a quantity representing the power to which a given number or expression is to be raised, usually expressed as a raised symbol beside the number or expression. A coefficient is a numerical or constant quantity placed before and multiplying the variable in an algebraic expression. In the expression 4x^2 (four x squared) the four is the coefficient and the 2 is the exponent.
An exponential equation.
A radical number is a number with a decimal. so a radical expression would be like 5 raised to the 2.5 power.
Anything raised to the power of zero is zero !
What is the number or expression in a power that is multiplied by itself
A number raised to the second power is a number times itself. This can also be stated as a number squared.
Any number raised to the power of 1 is equal to itself.