Question

Write each radical expression using exponents, and each exponential expression using radicals.

${10}^{-\raisebox{1ex}{$3$}\!\left/ \!\raisebox{-1ex}{$2$}\right.}$

Short answer

The exponential expression${10}^{-\raisebox{1ex}{$3$}\!\left/ \!\raisebox{-1ex}{$2$}\right.}$ can be written as$\frac{1}{\sqrt{{10}^3}}$ using radical.

Step-by-step solution

Step 1. Definition of nth root and rational exponents.

• If n is a positive integer, then the principal${\mathit{n}}^{\mathbf{t}\mathbf{h}}$root of ais defined as follows

$\begin{array}{l}\sqrt[n]{a}=b\iff a=b^n\\ \sqrt[n]{a}=a^{\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$n$}\right.}\end{array}$

If n is even, we must have$a\ge 0,b\ge 0$

• For any rational exponent $\raisebox{1ex}{$m$}\!\left/ \!\raisebox{-1ex}{$n$}\right.$in lowest terms, where m and n are integers and$n>0$, we define$a^{\raisebox{1ex}{$m$}\!\left/ \!\raisebox{-1ex}{$n$}\right.}=\sqrt[n]{a^m}={\left(\sqrt[n]{a}\right)}^m$

If n is even, we must have$a\ge 0$

Step 2. Laws of Exponents.

a and b are real numbers and m and n are integers

• $a^{mn}={\left(a^m\right)}^n$
  
• $a^{-n}=\frac{1}{a^n}$
  

Step 3. Evaluate the given expression.

Given${10}^{-\raisebox{1ex}{$3$}\!\left/ \!\raisebox{-1ex}{$2$}\right.}$

Here we will first reciprocate this to get a positive exponent then convert it into a radical by removing the fraction.

Step 4. Simplify the given expression.

$\begin{array}{l}{10}^{-\raisebox{1ex}{$3$}\!\left/ \!\raisebox{-1ex}{$2$}\right.}=\frac{1}{{10}^{\raisebox{1ex}{$3$}\!\left/ \!\raisebox{-1ex}{$2$}\right.}}\\ \Rightarrow {10}^{-\raisebox{1ex}{$3$}\!\left/ \!\raisebox{-1ex}{$2$}\right.}=\frac{1}{{\left({10}^{\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.}\right)}^3}\\ \Rightarrow {10}^{-\raisebox{1ex}{$3$}\!\left/ \!\raisebox{-1ex}{$2$}\right.}=\frac{1}{{\left(\sqrt{10}\right)}^3}\\ \Rightarrow {10}^{-\raisebox{1ex}{$3$}\!\left/ \!\raisebox{-1ex}{$2$}\right.}=\frac{1}{\sqrt{{10}^3}}\end{array}$

So, the exponential expression${10}^{-\raisebox{1ex}{$3$}\!\left/ \!\raisebox{-1ex}{$2$}\right.}$ can be written as$\frac{1}{\sqrt{{10}^3}}$ using radical.