If from twice a number you subtract four, the difference is twenty

Discussion in 'Calculator Requests' started by math_celebrity, Jan 18, 2024.

  1. math_celebrity

    math_celebrity Administrator Staff Member

    The phrase a number means an arbitrary variable. We can pick any letter a-z except for i and e.

    Let's choose x.

    Twice a number means we multiply x by 2:

    Subtract four:
    2x - 4

    The word is means equal to. We set 2x - 4 equal to 20 for our algebraic expression:
    2x - 4 = 20

    If the problem asks you to solve for x:
    we plug this equation into our calculator and get x = 12

Share This Page