simplify rational expression  

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well doesn't x/x =1? so wouldn't it be 1 - 2 which equals -1? idk. thats what i would think though.

I'm guessing that she needs to simplify (x) / (x-2).This expression IS simplified.For another example, let's simplify something like (x - 2) / xThis is just x/x - 2/x. Just think about "undoing" the addition of two fractions with equal denominators.x/x - 2/x is the same as 1 - 2/xI do, however, agree with the earlier posts. Without grouping symbols, it's hard to tell what you intend. In short, parentheses DO matter.