# How do you evaluate 4( a + b - c) given a= 2, b= 7, and c= 4?

Apr 30, 2016

$= 20$

#### Explanation:

The expression provided is :
$4 \left(a + b - c\right)$

Data provided is:
color(blue)(a = 2) , color(green)(b = 7) , color(purple)( c= 4
Substituting the values for the variables in the expression.

$4 \left(a + b - c\right) = 4 \left(\textcolor{b l u e}{2} + \textcolor{g r e e n}{7} - \textcolor{p u r p \le}{4}\right)$

$= 4 \left(9 - 4\right)$

$= 4 \left(5\right)$

$= 20$