Chapter 1.3, Problem 72STP

To determine

To Evaluate The expression $9^2$

Answer to Problem 72STP

  $9^2=81$

Explanation of Solution

Given:

The expression $9^2$

Concept Used:

For $a$ and $n$

  $a^n=a\times a\times a\mathrm{...}\times a\text{ (}n\text{-times)}$

Calculation:

For the expression $9^2$

Using the rule that

For $a$ and $n$

  $a^n=a\times a\times a\mathrm{...}\times a\text{ (}n\text{-times)}$

Replacing $a$ with $9$ and $n$ with $2$

  $\begin{array}{c}{9}^2=9\times 9\\ =81\end{array}$

Therefore, $9^2=81$

Conclusion:

  $9^2=81$