# Chapter 3 - Exponents, Polynomials and Functions - 3.1 Rules for Exponents - 3.1 Exercises: 43

$\dfrac{25}{9}$

#### Work Step by Step

$\bf{\text{Solution Outline:}}$ To simplify the given expression, $\left( \dfrac{3}{5} \right)^{-2} ,$ use the laws of exponents. $\bf{\text{Solution Details:}}$ Using the Power of a Quotient Rule of the laws of exponents, which is given by $\left( \dfrac{x^m}{y^n} \right)^p=\dfrac{x^{mp}}{y^{np}},$ the expression above is equivalent to \begin{array}{l}\require{cancel} \left( \dfrac{3}{5} \right)^{-2} \\\\= \dfrac{3^{-2}}{5^{-2}} .\end{array} Using the Negative Exponent Rule of the laws of exponents, which states that $x^{-m}=\dfrac{1}{x^m}$ or $\dfrac{1}{x^{-m}}=x^m,$ the expression above is equivalent to \begin{array}{l}\require{cancel} \dfrac{3^{-2}}{5^{-2}} \\\\= \dfrac{5^{2}}{3^{2}} \\\\= \dfrac{25}{9} .\end{array}

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