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What is the value of \(\left(\frac{1}{3}\right)^{-4}\)?

Answer and explanation

Correct answer: 81

The negative-exponent law is \(a^{-n}=\frac{1}{a^n}\)。 Thus, \(\left(\frac{1}{3}\right)^{-4}=\left(\frac{3}{1}\right)^4=3^4=81\)。 Therefore, 81 is correct. The value \(\frac{1}{81}\) is incorrect because it would result from applying the positive fourth power without taking the reciprocal. Exam tip: for a negative exponent, first invert the base and then apply the positive exponent.

Related tags

Number SystemsExponentsNegative ExponentsPowersGrade 9MathematicsClass 9 Mcq

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