Teacher2Teacher 
Q&A #1530 
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From: Loyd To: Teacher2Teacher Public Discussion Date: 2003030308:55:33 Subject: Re: x squared minus one divided by one minus x On 2003030123:23:15, Anonymous wrote: > >How do I do this? >so far I've got (x+1)(x1)/(x1) >cancel out the x1 >leaving me with x+2/1 >the answer is (x+1) but why why why??? > Replace "leaving me with x+2/1" to x+1/1 The last expression is equal to (x+1). A fraction has three signs: +a + You can change any two of them and the fraction will still be +b equavilent to the original. Thus: (x+1)/1 can be rewritten as: + (x1) +  which is equal to 1 (x1) +  which is equal to +1 (x1)
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