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January 26th, 2012, 08:58 AM   #1
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Adding/Subtracting Rational Expression (answer check)

Here's the problem:

7x/x+1 + 8/x-1 - 14/x^2-1


I'm getting 7x^2-x-6/(x+1)(x-1) and after factoring the numerator and simplifying, I end up with

7x+6/(x+1)

is this right?
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January 26th, 2012, 11:43 AM   #2
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Re: Adding/Subtracting Rational Expression (answer check)

Quote:
Originally Posted by boomer029
Here's the problem:

7x/x+1 + 8/x-1 - 14/x^2-1


I'm getting 7x^2-x-6/(x+1)(x-1) and after factoring the numerator and simplifying, I end up with

7x+6/(x+1)

is this right?
Hi boomer029,

You made a slight error with the sign of your second term. Go back and redo your first step. I think you'll find it to be .
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January 26th, 2012, 11:51 AM   #3
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Re: Adding/Subtracting Rational Expression (answer check)



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