# This is not a homework question. It is a question that I can't figure out!

1. Aug 23, 2011

### Goopy17

2. Aug 23, 2011

### micromass

Remember that

$$x^2=y^2$$

doesn't mean that x=y. (indeed, we can have x=-y as well).

Here

$$(4-9/2)^2=(5-9/2)^2$$

doesn't mean that we can leave off the squares.

3. Aug 23, 2011

### mathman

To simplify (-1/2)2 = (1/2)2