# Adding rational expressions with different denominators 6

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Taught by YourMathGal
• Currently 4.0/5 Stars.
5714 views | 1 rating
Part of video series
Meets NCTM Standards:
Lesson Summary:

In this lesson, we learn how to add and subtract algebraic fractions by getting a common denominator. The instructor provides a step-by-step guide to solving a long problem with three fractions, emphasizing the importance of factoring and simplifying the numerator before writing it over the common denominator. The lesson also highlights the usefulness of trial factors to find the least common denominator and to see if any factors can be canceled out.

Lesson Description:

Shows how to add and subtract algebraic fractions by getting a common denominator.

More free YouTube videos by Julie Harland are organized at http://yourmathgal.com

Questions answered by this video:
• How do you add and subtract rational expressions if they do not have the same denominator?
• How do you subtract, combine, and simplify (x + 1)/(1 - 2x) - (x + 3)/(4x - 3) - (9 - 7x - 10x^2)/(8x^2 - 10x + 3)?
• #### Staff Review

• Currently 4.0/5 Stars.
This video does a really long, difficult problems involving finding common denominators and adding and subtracting multiple algebraic fractions with unlike denominators. Factoring is required, and the result must be simplified to find the final answer. All steps for this problem are shown and explained well.