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If \(a\) and \(b\) are non-zero real numbers and \(n\) is a positive integer, which of the following relations is always correct?

Answer and explanation

Correct answer: \((ab)^{-n}=a^{-n}b^{-n}\)

A negative exponent represents a reciprocal. Thus, \((ab)^{-n}=\frac{1}{(ab)^n}=\frac{1}{a^n b^n}=a^{-n}b^{-n}\). Option B incorrectly uses addition; there is no exponent law that turns the reciprocal of a product into a sum of reciprocals. Exam tip: When an exponent is applied to a product in brackets, first apply the power-of-a-product rule.

Related tags

ExponentsNegative ExponentsLaws Of ExponentsNumber SystemsClass 9 MathematicsMathematicsClass 9 Mcq

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