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If \(x\ne0\), what is the correct form of \(x^{-4}\)?

Answer and explanation

Correct answer: \(\frac{1}{x^4}\)

The negative-exponent law is \(x^{-n}=\frac{1}{x^n}\), where \(x\ne0\). Therefore, \(x^{-4}=\frac{1}{x^4}\), so option B is correct. Option A incorrectly drops the negative sign without taking the reciprocal, while option D treats the exponent 4 as a factor. Exam tip: For a negative exponent, write the base in the denominator and change the exponent to positive.

Related tags

PolynomialsNegative ExponentsLaws Of ExponentsReal NumbersOperations On Real Numbers And The Laws Of ExponentsMathematicsClass 10 Mcq

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