How do you evaluate 3a - 5b + c + 2b - a for a=2, b=5, c=4?

Jun 18, 2015

color( red)(= -7

Explanation:

Solving by substituting the respective values of $a , b , c$ into the expression .

$3 a - 5 b + c + 2 b - a$

Given:
$a = 2 , b = 5 \mathmr{and} c = 4$

Substituting the same:
$3 . 2 - 5 . 5 + 4 + 2 . 5 - 2$

• Multiplying the terms
$6 - 25 + 4 + 10 - 2$
$6 + 4 + 10 - 25 - 2$
$= 20 - 25 - 2$
$20 - 27$
color( red)(= -7