Like what you saw?
Create FREE Account and:
 Watch all FREE content in 21 subjects(388 videos for 23 hours)
 FREE advice on how to get better grades at school from an expert
 FREE study tips and eBooks on various topics
Adding and Subtracting Rational Expressions  Problem 8
Alissa Fong
Alissa Fong
MA, Stanford University
Teaching in the San Francisco Bay Area
Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts
When we first learn about common denominators, we use the idea of the LCM, or least common multiple. For example, if you were asked to do 1/2  1/6, a common denominator that would work is 12, but it's not the least common denominator (which would be 6). Using the least common denominator simplifies our work later. Here, we apply that idea to finding the LCM of monomials, binomials, and trinomials: we could technically multiply them to find a multiple that would work, but often, the least common multiple will make our work easier in the long run.
Transcript Coming Soon!
Please enter your name.
Are you sure you want to delete this comment?
Alissa Fong
M.A. in Secondary Mathematics, Stanford University
B.S., Stanford University
Alissa has a quirky sense of humor and a relatable personality that make it easy for students to pay attention and understand the material. She has all the math tips and tricks students are looking for.
Your tutorials are good and you have a personality as well. I hope you have more advanced college level stuff, because I like the way you teach.”
Thanks alot for such great lectures... I never found learning this easier ever before... keep up the great work.... :)”
You seem so kind, it's awesome. Easier to learn from people who seem to be rooting for ya!' thanks”
Sample Problems (9)
Need help with a problem?
Watch expert teachers solve similar problems.

Adding and Subtracting Rational Expressions
Problem 1 6,453 viewsSimplify:
4 + 2 7 + 14x 5 + 10x 
Adding and Subtracting Rational Expressions
Problem 2 5,411 viewsSimplify:
2 − x − 3 x − 2 x² + 2x + 4 x³ − 8 
Adding and Subtracting Rational Expressions
Problem 3 4,932 viewsSimplify:
4b − 3b b² + 6b + 5 b² + 5b + 4 
Adding and Subtracting Rational Expressions
Problem 4 1,159 views 
Adding and Subtracting Rational Expressions
Problem 5 1,111 views 
Adding and Subtracting Rational Expressions
Problem 6 1,179 views 
Adding and Subtracting Rational Expressions
Problem 7 1,168 views 
Adding and Subtracting Rational Expressions
Problem 8 1,035 views 
Adding and Subtracting Rational Expressions
Problem 9 1,135 views
Comments (0)
Please Sign in or Sign up to add your comment.
·
Delete