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

1. Jan 23, 2014

### xsgx

Why does 2x-1/1-2x equal negative one?Can someone explain this to me because i don't get it.

2. Jan 23, 2014

### Staff: Mentor

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

Does that help?

3. Jan 23, 2014

### 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).

4. Jan 23, 2014

### Staff: Mentor

Hah! Good eye! :rofl:

5. Jan 23, 2014

### xsgx

Yeah i meant (2x-1)/(1-2x)

6. Jan 23, 2014

### xsgx

Yeah that helps.Thank you.