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If \(y\ne0\), what is the correct form of \(y^{-5}\)?

Answer and explanation

Correct answer: \(\frac{1}{y^5}\)

The rule for a negative exponent is \(a^{-n}=\frac{1}{a^n}\), where \(a\ne0\). Hence, \(y^{-5}=\frac{1}{y^5}\), so option B is correct. Option A represents the positive exponent \(y^5\), while option D incorrectly treats 5 as a coefficient instead of an exponent. Exam tip: For a negative exponent, take the reciprocal of the base and make the exponent positive.

Related tags

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

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