Chapter 6.7, Problem 25E

To determine

To evaluate : the expression $7xyz$ when $x=3$ , $y=-3$ and $z=4$ .

Answer to Problem 25E

The value of the expression is $-252$ .

Explanation of Solution

Given information :

Consider,

The expression provided in the question, $7xyz$

The values provided are $x=3$ , $y=-3$ and $z=4$ .

Calculation :

To evaluate the expression, it is needed to substitute $3$ for $x$ , $-3$ for $y$ and $4$ for $z$ in expression $7xyz$

Therefore, the value of the expression is obtained as:

  $\begin{array}{l}7xyz=7\left(3\right)\left(-3\right)\left(4\right)\\ 7xyz=21\left(-3\right)\left(4\right)\\ 7xyz=-63\left(4\right)\\ 7xyz=-252\end{array}$

Hence,

The value of the expression is $-252$ .