SOLUTION: I am having trouble solving this rational expression. 4a/5a-10 + 3a/10a-20 Kerri

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Question 242416: I am having trouble solving this rational expression. 4a/5a-10 + 3a/10a-20

Kerri

Answer by MRperkins(300) About Me  (Show Source):
You can put this solution on YOUR website!
Hi, Kerry. I will do my best to help you. If you need additional help, I can work some problems out on paper, scan them and email them to you. You can reach me at justin.sheppard.tech@hotmail.com with any follow up questions or if you have any other questions throughout the year. I will be happy to help explain anything that you are not understanding. It is very important that you learn these concepts now so that you are able to understand your future math courses.
So, you have %284a%29%2F%285a-10%29%2B%283a%29%2F%2810a-20%29
You need to get common denominators, remember %28numberator%29%2F%28denominator%29
So, you need to multiply the top and bottom of the left fraction by 2 and you get:
%288a%29%2F%2810a-20%29%2B%283a%29%2F%2810a-20%29
Now that you have a common denominator, you can add the two fractions and you get:
%288a%2B3a%29%2F%2810a-20%29 or just %2811a%29%2F%2810a-20%29