# How do you evaluate the expression n^2 when n=7 and when n= 0.4?

May 26, 2017

See a solution process below:

#### Explanation:

To evaluate this expression for when $n = 7$ we need to substitute $\textcolor{red}{7}$ for $\textcolor{red}{x}$ in the expression:

${\textcolor{red}{n}}^{2}$ becomes:

${\textcolor{red}{7}}^{2} \implies 7 \cdot 7 \implies 49$

To evaluate this expression for when $n = 0.4$ we need to substitute $\textcolor{red}{0.4}$ for $\textcolor{red}{x}$ in the expression:

${\textcolor{red}{n}}^{2}$ becomes:

${\left(\textcolor{red}{0.4}\right)}^{2} \implies 0.4 \cdot 0.4 \implies 0.16$