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Homework help question: 2x-1/1-2x = -1 why?

  1. Jan 23, 2014 #1
    Why does 2x-1/1-2x equal negative one?Can someone explain this to me because i don't get it.
     
  2. jcsd
  3. Jan 23, 2014 #2

    berkeman

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    Staff: Mentor

    Because -1 * (2x-1) = -2x+1 = (1-2x)

    Does that help?
     
  4. Jan 23, 2014 #3

    Mark44

    Staff: Mentor

    This probably doesn't mean what you actually wrote, but it turns out to be equal to -1 anyway. Here's what you wrote:
    $$2x - \frac{1}{1} - 2x = 2x - 1 - 2x = -1$$

    If you want what you write to be interpreted the way you mean it, use parentheses, as in (2x - 1)/(1 - 2x).
     
  5. Jan 23, 2014 #4

    berkeman

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    Staff: Mentor

    Hah! Good eye! :rofl:
     
  6. Jan 23, 2014 #5
    Yeah i meant (2x-1)/(1-2x)
     
  7. Jan 23, 2014 #6
    Yeah that helps.Thank you.
     
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