Adding Rational Expressions

2(4x+1)/5x-7 + 3(x-2)7-5x + -10x -1/5x-7


The answer in the book is -1. The closest I've come to getting that number is

5x -3/5x-7

But obviously that's not write and I had to do some pretty creative things to come up with that number. I'm pretty sure my error is happening when multiplying the middle term by -1 but still, I'm not getting the right answer. Any help is appreciated. Thanks.:)

P.S. If there's a way to more easily write out mathematical terms on the computer, I'd like to know about it.

You'll need to switch the terms in the denominator of the 2nd fraction and then change the plus in front of the 2nd fraction to a minus:

Quote:

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Originally Posted by Ingersoll

2(4x+1)/5x-7 + 3(x-2)7-5x + -10x -1/5x-7


The answer in the book is -1. The closest I've come to getting that number is

5x -3/5x-7

But obviously that's not write and I had to do some pretty creative things to come up with that number. I'm pretty sure my error is happening when multiplying the middle term by -1 but still, I'm not getting the right answer. Any help is appreciated. Thanks.:)

P.S. If there's a way to more easily write out mathematical terms on the computer, I'd like to know about it.

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Hi Ingersoll,

This is what you have written:



Apparently eumyang deciphered it, but it is majorly confusing. Use grouping symbols.

I look forward to more of your insightful help in the future. My apologies for leaving you so baffled by inadvertantly leaving out one grouping symbol in a problem with a stated answer and solution.

Quote:

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Originally Posted by Ingersoll

I look forward to more of your insightful help in the future. My apologies for leaving you so baffled by inadvertantly leaving out one grouping symbol in a problem with a stated answer and solution.

2(4x+1)/(5x-7) + 3(x-2)/(7-5x) + (-10x -1)/(5x-7)

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... you left out four grouping symbols and a division sign.