## Algebra 2 (1st Edition)

Published by McDougal Littell

# Chapter 6 Rational Exponents and Radical Functions - 6.2 Apply Properties of Rational Exponents - 6.2 Exercises - Skill Practice - Page 425: 82a

-2

#### Work Step by Step

Using the rules of exponents, we find: $$3\cdot \:9^{-x}=243 \\ 9^{-x}=81 \\ -x=2 \\ x=-2$$ Note, this can be solved since we know that: $$9 ^ 2 = 81$$

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.