Chapter 10.4, Problem 19CCR

To determine

To calculate: the value of expression for a value of variable.

Answer to Problem 19CCR

Value of expression $-\frac{56}{2x}$ at $x=-7$ is $\underset{\_}{4}$ .

Explanation of Solution

Given information:

1. Expression whose value needs to be determine is $-\frac{56}{2x}$ .
2. Value of variable at which value of expression needs to be calculated is $x=-7$ .

Calculation:

Expression is as follows

  $-\frac{56}{2x}$

Substitute $x=-7$ in given expression.

  $-\frac{56}{2x}=-\frac{56}{2\left(-7\right)}$

  $=\frac{-14\times 4}{-14}$

  $=4$

Hence value of expression $-\frac{56}{2x}$ at $x=-7$ is $\underset{\_}{4}$ .