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What is the correct form of a⁻³ if a ≠ 0?

Answer and explanation

Correct answer: 1/a³

The governing law for a negative integer exponent is a⁻ⁿ=1/aⁿ, provided a is nonzero. Applying this rule with n=3 gives a⁻³=1/a³, so option B is correct. The minus sign in the exponent means that the power is converted to its reciprocal; it does not place a minus sign before the whole expression. Thus option C is incorrect. Option A would be the result of simply ignoring the negative exponent and losing the reciprocal. Option D incorrectly treats 3 as a coefficient in the denominator, whereas the exponent applies to a and produces a³. The condition a≠0 is essential because a³ appears in the denominator, and division by zero is undefined. Therefore the exact equivalent form is 1/a³.

Related tags

ExponentsNegative-ExponentReciprocalOperations On Real Numbers And The Laws Of ExponentsPolynomialsMathematicsClass 10 Mcq

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