Skill: Interpret zero exponents

Explanation and Free Practice Resources

A zero exponent indicates that any nonzero number or algebraic expression raised to the zero power has value $1$ : $a^0=1$ for $a\ne0$ . This follows from preserving the exponent laws, since $a^m/a^m=a^{m-m}=a^0=1$ , and supports simplifying algebraic expressions and scientific notation; the exceptional expression $0^0$ is excluded rather than assigned this value.

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Detailed Explanation: Interpret zero exponents

A zero exponent means the expression equals $1$ , as long as the base is not zero:

a^0=1 \qquad \text{for } a\ne 0

Example

Simplify $(4x)^0$ , assuming $x\ne 0$ .

The base is $4x$ . Since $x\ne 0$ and $4\ne 0$ , we know $4x\ne 0$ .
Apply the zero-exponent rule:

(4x)^0=1

So, the simplified answer is

\boxed{1}

This rule follows the exponent laws because

\frac{a^3}{a^3}=a^{3-3}=a^0,

but any nonzero number divided by itself equals $1$ . Therefore, $a^0=1$ for $a\ne0$ . The expression $0^0$ is excluded from this rule.

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Exponents - Division Expanded Form To Exponents - Positive by Positive to Zero

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