Chapter 1.3, Problem 11C

To determine

To calculate: the value of expression $x^2-y$ when $x=4$ and $y=2$ .

Answer to Problem 11C

The value of expression $x^2-y$ is 14 when $x=4$ and $y=2$ .

Explanation of Solution

Given information : consider, the expression provided in the question,

  $x^2-y$ .

Calculation : to evaluate the expression, it is needed to substitute x by 4 and y by 2 then square the 4 then subtract 2 from the result .

$\begin{array}{l}{x}^2-y=4^2-2\\ x^2-y=16-2\\ x^2-y=14\end{array}$ [square and subtract ]

Hence,

Thus, The value of expression $x^2-y$ is 14 when $x=4$ any $y=2$ .