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If \(x\) is a non-zero real number and \(m\) is a positive integer, which of the following exponent rules is correct?

Answer and explanation

Correct answer: \(x^{-m}=\frac{1}{x^m}\)

A negative exponent represents the reciprocal of the corresponding positive power. Hence, \(x^{-m}=\frac{1}{x^m}\), provided \(x\neq0\). Option B incorrectly treats a negative exponent as merely adding a minus sign. Also, \(x^m\times x^{-m}=x^0=1\). Exam tip: For multiplication with the same base, add the exponents; rewriting negative powers as reciprocals helps avoid sign errors.

Related tags

Number SystemsExponentsNegative ExponentsLaws Of ExponentsClass 9 MathematicsMathematicsClass 9 Mcq

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