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

1 Answer
Don't Memorise
Jun 18, 2015

color( red)(= -7

Explanation:

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

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

Given:
a=2 , b = 5 and c=4

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

  • Multiplying the terms
    6 - 25 + 4 + 10 -2
  • Performing addition :
    6 + 4 + 10 - 25 - 2
    =20 - 25 - 2
  • Performing subtraction
    20 - 27
    color( red)(= -7
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