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If \(a\) is a nonzero real number, which of the following statements is always true?

Answer and explanation

Correct answer: \(a^{0}=1\)

The zero-exponent law states that \(a^{0}=1\) for every nonzero number, so option A is correct. Option B is false because \(a^{0}\) equals 1, not 0. In option C, \(a^{-1}=\frac{1}{a}\), which is not generally equal to \(a\); and in option D, \(a^{1}=a\). Exam tip: Apply \(a^{0}=1\) only when \(a\ne0\); do not include \(0^{0}\) in this rule.

Related tags

Zero ExponentLaws Of ExponentsReal NumbersMathematical ReasoningOperations On Real Numbers And The Laws Of ExponentsPolynomialsMathematicsClass 10 Mcq

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