Chapter 7.4, Problem 43CCR

To determine

Find the value of the expression $3b-5c$ when b = − 4 and c = − 15

Answer to Problem 43CCR

  $3b-5c=63$

Explanation of Solution

Given:

Find the value of the expression $3b-5c$ when a = 8, b = − 4 and

Concept Used:

Plug in the value of b = − 4 and c = − 15 into the expression $3b-5c$

Calculation:

Plug in the value of b = − 4 and c = − 15 into the expression $3b-5c$

  $\begin{array}{l}3b-5c\Rightarrow b=-4;c=-15\\ 3b-5c=3·b-5·c=3·(-4)-5·(-15)=-12+75=63\end{array}$

Thus, $3b-5c=63$