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# Operations with rational expressions — Harder example

Watch Sal work through a harder Operations with rational expressions problem.

## Want to join the conversation?

• *Hello!* 😢 Now I know my brain takes a little while to process but, I only in the 9th grade and I starting to practice for the SAT. I just made a 900 on my eighth practice test on Khan Academy. At the paste I am going I hope to make 1000 by May. My question to anybody is there any way you can break this down more. Especially, the factoring part!
- please and thank you 💕
• Hi! There are a lot of useful videos and exercises on Khan Academy that should help you understand the topics. Use the search bar to find the topic you're struggling with. :)

The SAT section assumes you have knowledge about these topics, and focuses more on how to solve a question.
• yooo he talks so slow, like usually i put 1.5, but i had to put 2 and stilll slow

great stuff tho
• What happened to the 3 in 3- 7x-56
• Sal combined like terms.
3 - 7x - 56 became -7x + (-56 + 3) = -7x - 53
• why did he times the (x+8) on the numerator??
• (x+8)/(x+8) = 1 and anything multiplied with one is itself. [Ex. (1)(2) = 2]
• still don't understand how to factor
• Sal made everything look easy
• Can we use long division to solve every problem in this topic? I think it's more straightforward than the other method.
• What if it is not able to be factored?
(1 vote)
• If it is unable to be factored, the two denominators are multiplied. [Ex. a/b + a/c = (ac+ab)/b(c)]