Learn math, science, English SAT & ACT from
highquaility study
videos by expert teachers
Thank you for watching the preview.
To unlock all 5,300 videos, start your free trial.
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.
Sample Problems (9)
Need help with a problem?
Watch expert teachers solve similar problems.

Adding and Subtracting Rational Expressions
Problem 1 6,528 viewsSimplify:
4 + 2 7 + 14x 5 + 10x 
Adding and Subtracting Rational Expressions
Problem 2 5,494 viewsSimplify:
2 − x − 3 x − 2 x² + 2x + 4 x³ − 8 
Adding and Subtracting Rational Expressions
Problem 3 5,023 viewsSimplify:
4b − 3b b² + 6b + 5 b² + 5b + 4 
Adding and Subtracting Rational Expressions
Problem 4 1,213 views 
Adding and Subtracting Rational Expressions
Problem 5 1,163 views 
Adding and Subtracting Rational Expressions
Problem 6 1,224 views 
Adding and Subtracting Rational Expressions
Problem 7 1,217 views 
Adding and Subtracting Rational Expressions
Problem 8 1,085 views 
Adding and Subtracting Rational Expressions
Problem 9 1,190 views
Comments (0)
Please Sign in or Sign up to add your comment.
·
Delete