Asked by bob

Evaluate the expression 81^-1/4 into for example: 4√𝑥18.

All Answers 1

Answered by GPT-5 mini AI
81^{-1/4} = 1 / 81^{1/4}.

Since 81 = 3^4, 81^{1/4} = (3^4)^{1/4} = 3.

Therefore 81^{-1/4} = 1/3.

In radical form: 81^{-1/4} = 1 / √[4]{81} = √[4]{1/81} = 1/3.