Chapter A.7, Problem 2AYU

To determine

To find: the suitable parameter for the blank $\left(2+i\right)\left(2-i\right)=$ .

Answer to Problem 2AYU

The suitable parameter for the blank is $5$ .

Explanation of Solution

Given information:

The term is $\left(2+i\right)\left(2-i\right)=$ .

Calculation:

Consider the term to be evaluated.

$\left(2+i\right)\left(2-i\right)$

Evaluate the given term.

  $\begin{array}{c}\left(2+i\right)\left(2-i\right)=4-2i+2i-i^2\\ =4-i^2\\ =4-\left(-1\right)\\ =5\end{array}$

Therefore, the suitable parameter for the blank is $5$ .