IDNLearn.com is the place where your questions are met with thoughtful and precise answers. Join our platform to receive prompt and accurate responses from experienced professionals in various fields.

Q4. What is the value of [tex]\(\sqrt[4]{(81)^{-2}}\)[/tex]?

a. [tex]\(\frac{1}{9}\)[/tex]
b. [tex]\(\frac{1}{3}\)[/tex]
c. 9
d. [tex]\(\frac{1}{81}\)[/tex]


Sagot :

To solve the given problem, we need to find the value of [tex]\(\sqrt[4]{(81)^{-2}}\)[/tex].

Let's proceed step-by-step:

1. Evaluate the exponentiation [tex]\((81)^{-2}\)[/tex]:
- When a number is raised to a power of [tex]\(-n\)[/tex], it’s equivalent to the reciprocal of that number raised to the power [tex]\(n\)[/tex]. Thus, we have:
[tex]\[ (81)^{-2} = \frac{1}{81^2} \][/tex]

2. Calculate [tex]\(81^2\)[/tex]:
- [tex]\(81\)[/tex] is [tex]\(9^2\)[/tex] and [tex]\((9^2)^2 = 9^4\)[/tex]:
[tex]\[ 81^2 = 9^4 = 6561 \][/tex]

3. Determine the reciprocal:
- Therefore:
[tex]\[ (81)^{-2} = \frac{1}{81^2} = \frac{1}{6561} \][/tex]

4. Compute the fourth root:
- We need to find the fourth root of [tex]\(\frac{1}{6561}\)[/tex]:
[tex]\[ \sqrt[4]{\frac{1}{6561}} \][/tex]

- A simpler way to approach this is to recognize:
[tex]\[ 6561 = 9^4 \][/tex]

[tex]\[ \sqrt[4]{\frac{1}{9^4}} = \frac{1}{\sqrt[4]{9^4}} \][/tex]

Since [tex]\(\sqrt[4]{9^4} = 9\)[/tex], we get:
[tex]\[ \sqrt[4]{\frac{1}{6561}} = \frac{1}{9} \][/tex]

5. Conclusion:
- Therefore, the value is [tex]\(\frac{1}{9}\)[/tex].

So, the correct answer is:
a. [tex]\(\frac{1}{9}\)[/tex]
We appreciate your participation in this forum. Keep exploring, asking questions, and sharing your insights with the community. Together, we can find the best solutions. Thanks for visiting IDNLearn.com. We’re dedicated to providing clear answers, so visit us again for more helpful information.